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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlement charge $ 42.3 $ 0.5 $ 9.8
Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 2.0 2.0 1.5
Interest cost 17.3 21.4 28.0
Expected asset return (39.0) (38.4) (41.1)
Amortized actuarial loss 10.8 8.6 6.4
Amortized prior service cost (credit) 0.1 0.1 0.0
Settlement charge 42.3 0.5 10.4
Net periodic benefit cost (credit) 33.5 (5.8) 5.2
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 0.3 0.4 0.3
Interest cost 8.4 10.2 12.8
Expected asset return 0.0 0.0 0.0
Amortized actuarial loss 1.7 1.0 0.1
Amortized prior service cost (credit) (1.5) (1.5) (1.5)
Settlement charge 0.0 0.0 0.0
Other postretirement benefit cost (credit) $ 8.9 $ 10.1 $ 11.7