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Benefit Plans, Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits [Member]      
Components of Net Periodic Benefit Cost [Abstract]      
Service cost $ 7.7 $ 7.7 $ 6.8
Interest cost 7.9 10.5 14.0
Expected return on plan assets (22.0) (20.1) (18.2)
Amortization of prior service cost 0.0 0.0 0.0
Recognized net actuarial (gain) loss 12.1 13.9 10.1
Settlement/curtailment (gain) loss 3.4 6.4 (0.1)
Net periodic benefit cost 9.1 18.4 12.6
Post-Retirement Benefits [Member]      
Components of Net Periodic Benefit Cost [Abstract]      
Service cost 0.1 0.2 0.2
Interest cost 0.1 0.2 0.2
Expected return on plan assets 0.0 0.0 0.0
Amortization of prior service cost 0.0 0.0 0.0
Recognized net actuarial (gain) loss (0.8) (0.9) (0.9)
Settlement/curtailment (gain) loss (1.6) 0.0 0.0
Net periodic benefit cost $ (2.2) $ (0.5) $ (0.5)