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Pension Plans - Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Retirement Benefits [Abstract]    
Projected benefit obligation $ 71.3 $ 96.8
Accumulated benefit obligation 64.0 87.1
Fair value of plan assets $ 0.0 $ 9.6