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Income Taxes - Quarterly Disclosure (Details9) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Investments, Owned, Federal Income Tax Note [Line Items]    
Income tax (provision) benefit $ 34.2 $ (8.0)
Effective Income Tax Rate Reconciliation, Percent 25.90% 38.80%
Discrete tax benefits (expense) $ 0.8 $ (0.2)