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Pension and Non-pension Post-employment Benefit Plans - Surplus (Deficit) in Defined Benefit Pension and Other Benefit Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]    
Plan assets, end of year $ 395.5 $ 377.2
Pension Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Accrued benefit obligations, end of year (355.8) (325.6)
Plan assets, end of year 395.5 377.2
Excess (deficiency) of plan assets over accrued benefit obligations 39.7 51.6
Other Benefit Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Accrued benefit obligations, end of year (75.5) (65.8)
Plan assets, end of year 0.0 0.0
Excess (deficiency) of plan assets over accrued benefit obligations $ (75.5) $ (65.8)