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Income Taxes (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Tax Credit Carryforward [Line Items]      
Deferred Tax Assets, Tax Credit Carryforwards, Foreign $ 267.9    
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits      
Balance at beginning of period 22.9 $ 44.5 $ 143.9
Additions for current year tax positions 1.5 2.3 12.0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions (2.8) (23.5) 0.0
Reductions for settlements with tax authorities (1.5) (0.4) (111.4)
Balance at end of period $ 20.1 $ 22.9 $ 44.5