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Retirement and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 19.4 $ 17.4 $ 17.2
Interest cost 42.7 48.9 45.6
Expected return on plan assets (64.3) (65.0) (74.0)
Amortization of prior service cost 0.3 0.4 0.5
Curtailments   (8.9)  
Net remeasurement losses (gains) 12.1 43.1 49.1
Net Periodic Benefit Cost (Income) 10.2 35.9 38.4
Postretirement      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 1.0 1.1 1.6
Interest cost 4.2 5.9 7.6
Expected return on plan assets (3.5) (3.9) (4.8)
Amortization of prior service cost (6.0) (3.8) 0.2
Net remeasurement losses (gains) 2.6 6.4 (5.6)
Net Periodic Benefit Cost (Income) $ (1.7) $ 5.7 $ (1.0)