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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Foreign currency translation $ (87.7) $ (289.1)
Translation (loss) gain on net investment hedge, net of income taxes of $(23.1) and $11.2, respectively (39.9) 24.8
Translation gain (loss) on net investment hedge, taxes (23.1) 11.2
Translation loss on long-term intercompany loans (128.8) (133.7)
Unrealized gain on investments, net of income taxes of $3.4 and $4.2, respectively 15.3 18.6
Unrealized gain on investments, taxes 3.4 4.2
Defined Benefit Plan Disclosure [Line Items]    
Accumulated other comprehensive loss (288.2) (426.1)
Defined benefit pension plans, net of income taxes of $(27.8) for both 2017 and 2016    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plans (50.5) (50.4)
Defined benefit plans, taxes (27.8) (27.8)
Retiree health care plan, net of income taxes of $2.0 and $2.1, respectively    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plans 3.4 3.7
Defined benefit plans, taxes $ 2.0 $ 2.1