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Retirement Benefits (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Termination benefits   $ 17.4  
Pension Benefits [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 2,720.1 2,633.9  
Service cost 15.1 12.7 $ 12.7
Interest cost 68.4 86.3 105.5
Benefits paid (235.0) (258.0)  
Subsidy paid 0.0 0.0  
Effect of currency rates (1.3) 4.3  
Net actuarial (gains) losses - discount rate change (104.0) 235.3  
Net actuarial (gains) losses - other 53.7 (5.3)  
Settlement gain 0.0 0.0  
Plan curtailments 0.0 0.0  
Termination benefits 0.0 10.9 0.0
Benefit obligation at end of year 2,517.0 2,720.1 2,633.9
Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 357.6 345.3  
Service cost 1.5 2.3 1.9
Interest cost 8.0 10.7 14.8
Benefits paid (28.9) (30.4)  
Subsidy paid 0.4 0.8  
Effect of currency rates 0.0 0.0  
Net actuarial (gains) losses - discount rate change (9.0) 25.5  
Net actuarial (gains) losses - other 0.7 (0.8)  
Settlement gain (43.0) 0.0  
Plan curtailments 0.0 (2.5)  
Termination benefits 0.0 6.7 0.0
Benefit obligation at end of year $ 287.3 $ 357.6 $ 345.3