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Changes in Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Tax impact $ 28.1 $ 34.7
Total reclassifications for the period 2.7  
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Total before tax 3.4 4.5
Tax impact 0.7 1.2
Total reclassifications for the period 2.7 3.3
Pension    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Prior service costs 0.0 0.0
Net gain (loss) 3.8 4.8
Postretirement    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Prior service costs (0.2) (0.3)
Net gain (loss) $ (0.2) $ 0.0