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Pension and Other Post-Employment Plans - Summary of Changes in Projected Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S. Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 169.4 $ 161.6  
Service cost 0.0 0.0 $ 0.0
Interest cost 5.8 6.8 6.4
Actuarial loss 15.2 10.8  
Benefits and expenses paid (10.2) (9.8)  
Amendments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Benefit obligation, end of year 180.2 169.4 161.6
Accumulated benefit obligation, end of year 180.2 169.4  
Non-U.S. Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 52.3 49.8  
Service cost 0.2 0.2 0.2
Interest cost 1.0 1.4 1.3
Actuarial loss 5.1 2.0  
Benefits and expenses paid (3.0) (3.1)  
Amendments 0.2 [1] 0.0 2.6
Foreign currency translation 1.8 2.0  
Benefit obligation, end of year 57.6 52.3 $ 49.8
Accumulated benefit obligation, end of year $ 57.6 $ 52.3  
[1] While the non-U.S. benefit plan has not yet been amended, this component of the change to the benefit obligation of the non-U.S. benefit plan during the year ended December 31, 2020 represents the estimated incremental impact of the November 2020 U.K. High Court ruling, as described above.