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Pension and Other Post-Employment Plans - Summary of Funded Status (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S. Benefit Plan      
Funded Status of Plan      
Fair value of plan assets, end of year $ 131.6 $ 118.8 $ 131.7
Benefit obligation, end of year 169.4 161.6 179.0
Funded status, end of year (37.8) (42.8)  
Non-U.S. Benefit Plan      
Funded Status of Plan      
Fair value of plan assets, end of year 55.2 47.7 54.7
Benefit obligation, end of year 52.3 49.8 $ 54.7
Funded status, end of year $ 2.9 $ (2.1)