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Employee Retirement Benefits - Accumulated Benefit Plan Obligation in Excess of Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pension    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation $ 160.0 $ 149.4
Accumulated benefit obligation 160.0 149.4
Fair value of plan assets 140.4 133.2
Postretirement    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation 1.1 1.0
Accumulated benefit obligation 0.0 0.0
Fair value of plan assets $ 0.0 $ 0.0