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Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - Pension and other postretirement benefits - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7.1 $ 9.5 $ 14.2 $ 19.0
Interest cost 18.2 10.4 36.5 20.8
Expected return on plan assets (16.4) (16.6) (32.8) (33.2)
Amortization of prior service costs 0.0 0.0 0.0 0.1
Recognized net actuarial (gains)/losses (5.0) 0.1 (10.0) 0.1
Other 4.4 0.0 4.4 0.0
Net periodic benefit cost $ 8.3 $ 3.4 $ 12.3 $ 6.8