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Pension and Other Post-Employment Plans - Summary of Funded Status (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S. Benefit Plan      
Funded Status of Plan      
Fair value of plan assets, end of year $ 142.5 $ 131.6 $ 118.8
Benefit obligation, end of year 180.2 169.4 161.6
Funded status, end of year (37.7) (37.8)  
Non-U.S. Benefit Plan      
Funded Status of Plan      
Fair value of plan assets, end of year 57.4 55.2 47.7
Benefit obligation, end of year 57.6 52.3 $ 49.8
Funded status, end of year $ (0.2) $ 2.9