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Investments (Pledged Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments [Abstract]    
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties $ 2,463.2 $ 2,379.4
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities $ 665.8 $ 691.9