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For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.","units":{"USD":[{"end":"2011-04-30","val":10800000,"accn":"0001193125-11-239164","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-01"},{"end":"2011-04-30","val":10800000,"accn":"0001193125-11-327561","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-01"},{"end":"2011-04-30","val":10800000,"accn":"0001193125-12-092226","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-01"},{"end":"2011-04-30","val":10800000,"accn":"0001193125-12-275378","fy":2012,"fp":"FY","form":"10-K","filed":"2012-06-19","frame":"CY2011Q1I"},{"end":"2011-07-31","val":10200000,"accn":"0001193125-11-239164","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-01","frame":"CY2011Q2I"},{"end":"2011-10-31","val":11600000,"accn":"0001193125-11-327561","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-01","frame":"CY2011Q3I"},{"end":"2012-01-31","val":12700000,"accn":"0001193125-12-092226","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-01","frame":"CY2011Q4I"},{"end":"2012-04-30","val":13700000,"accn":"0001193125-12-275378","fy":2012,"fp":"FY","form":"10-K","filed":"2012-06-19"},{"end":"2012-04-30","val":13700000,"accn":"0001193125-12-375757","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-08-30"},{"end":"2012-04-30","val":13700000,"accn":"0001193125-12-485740","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-11-29"},{"end":"2012-04-30","val":13700000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28"},{"end":"2012-04-30","val":13700000,"accn":"0001193125-13-269098","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-24"},{"end":"2012-04-30","val":13700000,"accn":"0001193125-14-124245","fy":2013,"fp":"FY","form":"10-KT","filed":"2014-03-31","frame":"CY2012Q1I"},{"end":"2012-07-31","val":14200000,"accn":"0001193125-12-375757","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-08-30","frame":"CY2012Q2I"},{"end":"2012-10-31","val":31800000,"accn":"0001193125-12-485740","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-11-29","frame":"CY2012Q3I"},{"end":"2013-01-31","val":32900000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-04-30","val":33800000,"accn":"0001193125-13-269098","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-24"},{"end":"2013-04-30","val":33800000,"accn":"0001193125-13-352168","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-08-29"},{"end":"2013-04-30","val":33800000,"accn":"0001193125-13-463614","fy":2014,"fp":"Q2","form":"10-Q","filed":"2013-12-05"},{"end":"2013-04-30","val":33800000,"accn":"0001193125-14-124245","fy":2013,"fp":"FY","form":"10-KT","filed":"2014-03-31","frame":"CY2013Q1I"},{"end":"2013-07-31","val":34900000,"accn":"0001193125-13-352168","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-08-29","frame":"CY2013Q2I"},{"end":"2013-10-31","val":35700000,"accn":"0001193125-13-463614","fy":2014,"fp":"Q2","form":"10-Q","filed":"2013-12-05","frame":"CY2013Q3I"},{"end":"2013-12-31","val":35300000,"accn":"0001193125-14-124245","fy":2013,"fp":"FY","form":"10-KT","filed":"2014-03-31"},{"end":"2013-12-31","val":35300000,"accn":"0001193125-14-188825","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-12-31","val":35300000,"accn":"0001193125-14-299391","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-12-31","val":35300000,"accn":"0001193125-14-399710","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2013Q4I"},{"end":"2014-03-31","val":35900000,"accn":"0001193125-14-188825","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":36100000,"accn":"0001193125-14-299391","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07","frame":"CY2014Q2I"},{"end":"2014-09-30","val":36800000,"accn":"0001193125-14-399710","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"}]}},"AdditionalPaidInCapitalCommonStock":{"label":"Additional Paid in Capital, Common Stock","description":"Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.","units":{"USD":[{"end":"2013-12-31","val":40200000,"accn":"0001193125-17-065673","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2013Q4I"},{"end":"2014-12-31","val":111300000,"accn":"0001193125-17-065673","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01"},{"end":"2014-12-31","val":111300000,"accn":"0001193125-18-061717","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2014Q4I"},{"end":"2015-12-31","val":91600000,"accn":"0001193125-17-065673","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01"},{"end":"2015-12-31","val":91600000,"accn":"0001193125-17-156326","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2015-12-31","val":91600000,"accn":"0001193125-17-238757","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28"},{"end":"2015-12-31","val":91600000,"accn":"0001193125-17-330221","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2015-12-31","val":91600000,"accn":"0001193125-18-061717","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2015Q4I"},{"end":"2016-03-31","val":83400000,"accn":"0001193125-17-156326","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2016-03-31","val":83400000,"accn":"0001193125-17-238757","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28","frame":"CY2016Q1I"},{"end":"2016-06-30","val":61200000,"accn":"0001193125-17-238757","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28"},{"end":"2016-06-30","val":61200000,"accn":"0001193125-17-330221","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2016Q2I"},{"end":"2016-09-30","val":73300000,"accn":"0001193125-17-330221","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2016Q3I"},{"end":"2016-12-31","val":100800000,"accn":"0001193125-17-065673","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01"},{"end":"2016-12-31","val":100800000,"accn":"0001193125-17-156326","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2016-12-31","val":100800000,"accn":"0001193125-17-238757","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28"},{"end":"2016-12-31","val":100800000,"accn":"0001193125-17-330221","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2016-12-31","val":100800000,"accn":"0001193125-18-061717","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016Q4I"},{"end":"2017-03-31","val":56500000,"accn":"0001193125-17-156326","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2017-03-31","val":56500000,"accn":"0001193125-17-238757","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28","frame":"CY2017Q1I"},{"end":"2017-06-30","val":50800000,"accn":"0001193125-17-238757","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28"},{"end":"2017-06-30","val":50800000,"accn":"0001193125-17-330221","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2017Q2I"},{"end":"2017-09-30","val":55400000,"accn":"0001193125-17-330221","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2017Q3I"},{"end":"2017-12-31","val":43300000,"accn":"0001193125-18-061717","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"}]}},"CashAndCashEquivalentsFairValueDisclosure":{"label":"Cash and Cash Equivalents, Fair Value Disclosure","description":"Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2013-01-31","val":34500000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28","frame":"CY2012Q4I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.","units":{"USD":[{"start":"2009-05-01","end":"2010-04-30","val":48200000,"accn":"0001193125-12-275378","fy":2012,"fp":"FY","form":"10-K","filed":"2012-06-19","frame":"CY2009"},{"start":"2010-05-01","end":"2010-07-31","val":8100000,"accn":"0001193125-11-239164","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-01","frame":"CY2010Q2"},{"start":"2010-05-01","end":"2010-10-31","val":13400000,"accn":"0001193125-11-327561","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-01"},{"start":"2010-08-01","end":"2010-10-31","val":5300000,"accn":"0001193125-11-327561","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-01","frame":"CY2010Q3"},{"start":"2010-05-01","end":"2011-01-31","val":14100000,"accn":"0001193125-12-092226","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-01"},{"start":"2010-11-01","end":"2011-01-31","val":700000,"accn":"0001193125-12-092226","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-01","frame":"CY2010Q4"},{"start":"2010-05-01","end":"2011-04-30","val":-2700000,"accn":"0001193125-12-275378","fy":2012,"fp":"FY","form":"10-K","filed":"2012-06-19"},{"start":"2010-05-01","end":"2011-04-30","val":-2700000,"accn":"0001193125-13-269098","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-24"},{"start":"2010-05-01","end":"2011-04-30","val":-2700000,"accn":"0001193125-14-124245","fy":2013,"fp":"FY","form":"10-KT","filed":"2014-03-31","frame":"CY2010"},{"start":"2011-05-01","end":"2011-07-31","val":-2600000,"accn":"0001193125-11-239164","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-01"},{"start":"2011-05-01","end":"2011-07-31","val":-2600000,"accn":"0001193125-12-375757","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-08-30","frame":"CY2011Q2"},{"start":"2011-05-01","end":"2011-10-31","val":-5000000,"accn":"0001193125-11-327561","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-01"},{"start":"2011-05-01","end":"2011-10-31","val":-5000000,"accn":"0001193125-12-485740","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-11-29"},{"start":"2011-08-01","end":"2011-10-31","val":-2400000,"accn":"0001193125-11-327561","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-01"},{"start":"2011-08-01","end":"2011-10-31","val":-2400000,"accn":"0001193125-12-485740","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-11-29","frame":"CY2011Q3"},{"start":"2011-05-01","end":"2012-01-31","val":3000000,"accn":"0001193125-12-092226","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-01"},{"start":"2011-05-01","end":"2012-01-31","val":3000000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28"},{"start":"2011-11-01","end":"2012-01-31","val":8000000,"accn":"0001193125-12-092226","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-01"},{"start":"2011-11-01","end":"2012-01-31","val":8000000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28","frame":"CY2011Q4"},{"start":"2011-05-01","end":"2012-04-30","val":4800000,"accn":"0001193125-12-275378","fy":2012,"fp":"FY","form":"10-K","filed":"2012-06-19"},{"start":"2011-05-01","end":"2012-04-30","val":4800000,"accn":"0001193125-13-269098","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-24"},{"start":"2011-05-01","end":"2012-04-30","val":4800000,"accn":"0001193125-14-124245","fy":2013,"fp":"FY","form":"10-KT","filed":"2014-03-31"},{"start":"2011-05-01","end":"2012-04-30","val":4800000,"accn":"0001193125-15-064260","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2011"},{"start":"2012-05-01","end":"2012-07-31","val":-1200000,"accn":"0001193125-12-375757","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-08-30"},{"start":"2012-05-01","end":"2012-07-31","val":-1200000,"accn":"0001193125-13-352168","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-08-29","frame":"CY2012Q2"},{"start":"2012-05-01","end":"2012-10-31","val":8700000,"accn":"0001193125-12-485740","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-11-29"},{"start":"2012-05-01","end":"2012-10-31","val":8700000,"accn":"0001193125-13-463614","fy":2014,"fp":"Q2","form":"10-Q","filed":"2013-12-05"},{"start":"2012-08-01","end":"2012-10-31","val":9900000,"accn":"0001193125-12-485740","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-11-29"},{"start":"2012-08-01","end":"2012-10-31","val":9900000,"accn":"0001193125-13-463614","fy":2014,"fp":"Q2","form":"10-Q","filed":"2013-12-05","frame":"CY2012Q3"},{"start":"2012-05-01","end":"2013-01-31","val":21900000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28"},{"start":"2012-11-01","end":"2013-01-31","val":13200000,"accn":"0001193125-13-084215","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-02-28","frame":"CY2012Q4"},{"start":"2013-01-01","end":"2013-03-31","val":-30800000,"accn":"0001193125-14-188825","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q1"},{"start":"2012-05-01","end":"2013-04-30","val":-9700000,"accn":"0001193125-13-269098","fy":2013,"fp":"FY","form":"10-K","filed":"2013-06-24"},{"start":"2012-05-01","end":"2013-04-30","val":-9700000,"acc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