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Pension and Other Post-Employment Plans - Schedule of Net Periodic Pension (Benefit) Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S. Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 5.8 6.8 6.4
Expected return on plan assets (9.2) (8.7) (8.7)
Amortization of prior service costs 0.0 0.0 0.0
Amortization of actuarial losses 3.2 2.6 3.0
Net periodic pension (benefit) expense (0.2) 0.7 0.7
Non-U.S. Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.2 0.2 0.2
Interest cost 1.0 1.4 1.3
Expected return on plan assets (1.9) (2.0) (2.2)
Amortization of prior service costs 0.1 0.1 0.0
Amortization of actuarial losses 0.5 0.7 0.6
Net periodic pension (benefit) expense $ (0.1) $ 0.4 $ (0.1)