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Pensions - Summary of Components of Net Periodic Pension Expense (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
U.S. Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.0 $ 0.0
Interest cost 1.4 1.7
Amortization of actuarial loss 0.8 0.6
Expected return on plan assets (2.3) (2.2)
Net periodic pension (benefit) expense (0.1) 0.1
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 0.1 0.2
Expected return on plan assets (0.5) (0.5)
Net periodic pension (benefit) expense $ 0.0 $ 0.1