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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Provision (benefit) for taxes on income $ 122.3 $ (7.4)  
Valuation allowance $ 121.1    
Federal income tax at statutory rate 35.00%    
Unrecognized tax benefits $ 16.1   $ 19.4
Unrecognized tax benefits that would affect annual effective rate $ 0.6