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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of unrecognized tax benefits [Roll Forward]    
Balance as of January 1 $ 28.3 $ 48.5
Additions based on tax positions related to the current year 10.8 7.8
Decrease for the reversals of tax positions of prior years (1.5) (11.2)
Lapse of statute of limitations 0.0 (16.8)
Balance as of December 31 37.6 $ 28.3
Conclusion of Examination by Tax Authorities [Member]    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Gross unrecognized tax benefits where settlement in next twelve months is reasonably possible $ 1.4