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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, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S. Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 161.6 $ 179.0  
Service cost 0.0 0.0 $ 0.0
Interest cost 6.8 6.4 7.6
Actuarial loss (gain) 10.8 (13.9)  
Benefits and expenses paid (9.8) (9.9)  
Amendments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Benefit obligation, end of year 169.4 161.6 179.0
Accumulated benefit obligation, end of year 169.4 161.6  
Non-U.S. Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 49.8 54.7  
Service cost 0.2 0.2 0.2
Interest cost 1.4 1.3 1.4
Actuarial loss (gain) 2.0 (2.2)  
Benefits and expenses paid (3.1) (3.8)  
Amendments 0.0 2.6 [1]  
Foreign currency translation 2.0 (3.0)  
Benefit obligation, end of year 52.3 49.8 $ 54.7
Accumulated benefit obligation, end of year $ 52.3 $ 49.8  
[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, 2018 represents the estimated impact of the U.K. High Court ruling, as described above.