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- Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]    
Projected benefit obligation $ 188.7 $ 178.5
Accumulated benefit obligation 188.7 178.5
Fair value of plan assets $ 176.2 $ 160.8