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Employee Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Net Periodic Benefit Cost    
Interest cost $ (8.8) $ (13.6)
Net pension income 14.5 10.5
Defined Benefit Plan, Plan Assets, Benefits Paid 47.5 43.6
Employer contributions 1.6 7.8
Pension Benefits    
Net Periodic Benefit Cost    
Interest cost (8.8) (13.6)
Expected return on plan assets 24.2 24.2
Net periodic benefit income 15.4 10.6
Settlement charge (0.9) (0.1)
Net pension income 14.5 $ 10.5
Pension Benefits | Nonqualified Plan    
Net Periodic Benefit Cost    
Defined Benefit Plan, Plan Assets, Benefits Paid 0.8  
Pension Benefits | Qualified Plan    
Net Periodic Benefit Cost    
Employer contributions $ 0.8