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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]    
Change in unrealized appreciation (depreciation) of investments, applicable income tax expense (benefit) $ 58.7 $ 76.0
Change in noncredit component of impairment losses on fixed maturities, available for sale, applicable income tax expense (benefit) $ 0.6