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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Effective tax rate on income (loss) before taxes 30.20% (4.00%)  
Gain (loss) on foreign currency option and forward contracts, net $ 0.0 $ 36.5 $ 9.3