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Retirement Benefits (Details1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sheffield, UK Operations        
Defined Benefit Plan Disclosure [Line Items]        
Portion of loss in AOCI   $ 29.5    
Pension Plans Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year $ 1.6 2.8 $ 3.2 $ 6.0
Interest cost on benefits earned in prior years 24.0 17.5 48.0 35.3
Expected return on plan assets (25.6) (31.9) (51.3) (65.0)
Amortization of prior service cost (credit) 0.1 0.1 0.2 0.2
Amortization of net actuarial loss 14.4 15.9 28.8 31.9
Settlement loss (gain) 0.0 29.5 0.0 29.5
Total retirement benefit expense (income) 14.5 33.9 28.9 37.9
Other Postretirement Benefit Plan, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year 0.1 0.3 0.3 0.5
Interest cost on benefits earned in prior years 2.8 1.9 5.5 3.9
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost (credit) (0.3) (0.2) (0.5) (0.5)
Amortization of net actuarial loss 1.5 3.3 3.0 6.6
Settlement loss (gain) 0.0 0.0 0.0 0.0
Total retirement benefit expense (income) $ 4.1 $ 5.3 $ 8.3 $ 10.5