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Pensions - Summary of Components of Net Postretirement Pension Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.0 $ 0.0
Interest cost 1.7 1.6
Amortization of actuarial loss 0.6 0.8
Expected return on plan assets (2.2) (2.2)
Net postretirement pension expense 0.1 0.2
Non-U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.1 0.1
Interest cost 0.3 0.3
Amortization of actuarial loss 0.2 0.2
Expected return on plan assets (0.5) (0.6)
Net postretirement pension expense $ 0.1 $ 0.0