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Changes in Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Tax impact $ 19.1 $ 10.4 $ 48.5 $ 108.5
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total before tax 4.8 3.0 11.5 12.0
Tax impact 1.2 0.8 2.6 2.9
Total reclassifications for the period 3.6 2.2 8.9 9.1
Pension        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Prior service costs (benefit) (0.5) 0.0 (0.5) 0.1
Net gain (loss) 3.9 3.3 11.5 12.9
Postretirement        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Prior service costs (benefit) (0.2) 0.3 0.3 0.8
Net gain (loss) $ 0.2 $ 0.0 $ (0.2) $ 0.0