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Retirement Benefits (Details1) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss (gain) $ 0.0 $ (64.9) $ 0.0 $ (64.9)
Pension Plans Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year 3.0 3.8 9.0 11.3
Interest cost on benefits earned in prior years 17.2 17.1 52.5 51.3
Expected return on plan assets (31.6) (34.1) (96.6) (102.3)
Amortization of prior service cost (credit) 0.1 0.2 0.3 0.5
Amortization of net actuarial loss 15.8 18.9 47.7 56.7
Settlement loss (gain) 0.0 0.0 29.5 0.0
Total retirement benefit expense (income) 4.5 5.9 42.4 17.5
Other Postretirement Benefit Plan, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year 0.3 0.4 0.8 1.1
Interest cost on benefits earned in prior years 1.9 1.9 5.8 6.1
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost (credit) (0.2) (0.6) (0.7) (1.9)
Amortization of net actuarial loss 3.3 3.6 9.9 10.2
Settlement loss (gain) 0.0 (64.9) 0.0 (64.9)
Total retirement benefit expense (income) $ 5.3 $ (59.6) $ 15.8 $ (49.4)