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Benefit Plans and Other Postretirement Benefits, Amount Included in Accumulated Other Comprehensive Loss Not Yet Recognized as Expense (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accumulated other comprehensive income (loss), before tax    
Actuarial losses, net $ 247.7 $ 241.2
Prior service cost 7.4 9.5
United States    
Accumulated other comprehensive income (loss), before tax    
Actuarial losses, net 148.9 164.3
Prior service cost 6.6 8.7
Foreign Plans    
Accumulated other comprehensive income (loss), before tax    
Actuarial losses, net 98.8 76.9
Prior service cost $ 0.8 $ 0.8