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Retirement Benefits (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Settlement gain $ (64.9) $ 0.0 $ 0.0
Termination benefits   17.4  
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 15.1 12.7 12.7
Interest cost on benefits earned in prior years 68.4 86.3 105.5
Expected return on plan assets (136.4) (134.5) (131.3)
Amortization of prior service cost (credit) 0.6 0.7 0.3
Amortization of net actuarial loss 75.6 74.5 73.7
Settlement gain 0.0 0.0 0.0
Curtailment loss (gain) 0.0 0.0 0.0
Termination benefits 0.0 10.9 0.0
Total retirement benefit expense (income) 23.3 50.6 60.9
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 1.5 2.3 1.9
Interest cost on benefits earned in prior years 8.0 10.7 14.8
Expected return on plan assets 0.0 0.0 0.0
Amortization of prior service cost (credit) (2.4) (3.8) (2.9)
Amortization of net actuarial loss 13.9 10.8 13.5
Settlement gain (64.9) 0.0 0.0
Curtailment loss (gain) 0.0 (0.2) 0.0
Termination benefits 0.0 6.7 0.0
Total retirement benefit expense (income) $ (43.9) $ 26.5 $ 27.3