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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]              
Provision (benefit) for taxes on income $ 0.7 $ 121.5 $ (1.7) $ (9.5) $ 122.2 $ (11.2)  
Valuation allowance         $ 120.2    
Federal income tax at statutory rate (as a percent)         35.00%    
Unrecognized tax benefits $ 16.4       $ 16.4   $ 19.4
Unrecognized tax benefits that would affect annual effective rate         $ 0.6