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May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' 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insurer.","units":{"USD":[{"end":"2012-12-31","val":6700000,"accn":"0001104659-14-013406","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":3600000,"accn":"0001104659-14-013406","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":3600000,"accn":"0001104659-14-036552","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-12-31","val":3600000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-12-31","val":3600000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"end":"2013-12-31","val":3600000,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2013-12-31","val":3600000,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":4300000,"accn":"0001104659-14-036552","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":6800000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07","frame":"CY2014Q2I"},{"end":"2014-09-30","val":9200000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"},{"end":"2014-12-31","val":7100000,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2014-12-31","val":7100000,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31"},{"end":"2014-12-31","val":7100000,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2014Q4I"},{"end":"2015-03-31","val":4900000,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1I"}]}},"ReinsuranceRecoverablesOnUnpaidLosses":{"label":"Reinsurance Recoverables on Unpaid Losses (Deprecated 2016-01-31)","description":"Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.","units":{"USD":[{"end":"2010-12-31","val":62400000,"accn":"0001104659-14-013406","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2010Q4I"},{"end":"2011-12-31","val":77700000,"accn":"0001104659-14-013406","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2011-12-31","val":77700000,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2011-12-31","val":77700000,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31","frame":"CY2011Q4I"},{"end":"2012-12-31","val":102700000,"accn":"0001104659-14-013406","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2012-12-31","val":102700000,"accn":"0001104659-14-036552","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2012-12-31","val":102700000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2012-12-31","val":102700000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"end":"2012-12-31","val":102700000,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2012-12-31","val":102700000,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31","frame":"CY2012Q4I"},{"end":"2013-03-31","val":86600000,"accn":"0001104659-14-036552","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-03-31","val":86600000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":80300000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-06-30","val":80300000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2013Q2I"},{"end":"2013-09-30","val":73700000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2013Q3I"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-14-013406","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-14-036552","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31"},{"end":"2013-12-31","val":63600000,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2013Q4I"},{"end":"2014-03-31","val":55000000,"accn":"0001104659-14-036552","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2014-03-31","val":55000000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2014-03-31","val":55000000,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2014Q1I"},{"end":"2014-06-30","val":57400000,"accn":"0001104659-14-058267","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2014-06-30","val":57400000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":55500000,"accn":"0001104659-14-077689","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"},{"end":"2014-12-31","val":48700000,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2014-12-31","val":48700000,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31"},{"end":"2014-12-31","val":48700000,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2014Q4I"},{"end":"2015-03-31","val":48800000,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1I"}]}},"RepaymentsOfLinesOfCredit":{"label":"Repayments 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494717,"accn":"0001104659-15-013655","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"end":"2014-12-31","val":1494717,"accn":"0001104659-15-024704","fy":2014,"fp":"FY","form":"10-K/A","filed":"2015-03-31"},{"end":"2014-12-31","val":1494717,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1314588,"accn":"0001104659-15-033762","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1I"}]}},"TreasuryStockSharesAcquired":{"label":"Treasury 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Stock, Shares, Retired","description":"Number of shares of common and preferred stock retired from treasury during the 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