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Changes in Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Amortization of pension and postretirement components $ 1.1 $ (0.2)   $ 3.2 $ 0.4
Total before tax 32.8 55.4   60.9 102.1
Tax impact 7.8 13.8   14.2 22.7
Net income attributable to common shareholders 24.9 41.6 $ 37.8 46.6 79.4
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefits          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Total before tax (0.3) (0.6)   (0.6) (1.1)
Tax impact 0.0 (0.1)   (0.1) (0.2)
Net income attributable to common shareholders (0.3) (0.5)   (0.5) (0.9)
Pension | Reclassification out of Accumulated Other Comprehensive Income | Prior service costs          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Amortization of pension and postretirement components (0.2) (0.2)   (0.4) (0.4)
Pension | Reclassification out of Accumulated Other Comprehensive Income | Net gain (loss)          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Amortization of pension and postretirement components 0.1 0.0   0.1 0.1
Postretirement | Reclassification out of Accumulated Other Comprehensive Income | Prior service costs          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Amortization of pension and postretirement components 0.0 (0.2)   0.0 (0.4)
Postretirement | Reclassification out of Accumulated Other Comprehensive Income | Net gain (loss)          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Amortization of pension and postretirement components $ (0.2) $ (0.2)   $ (0.3) $ (0.4)