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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, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Amortization of pension and postretirement components $ 0.6 $ 1.3     $ 3.8 $ 1.7
Total before tax 66.6 63.3     127.5 165.4
Tax impact 15.7 16.2     29.9 38.9
Net income attributable to common shareholders 50.5 47.1 $ 41.6 $ 37.8 97.1 126.5
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 (0.4) (2.0)     (1.0) (3.1)
Tax impact (0.1) (0.2)     (0.2) (0.4)
Net income attributable to common shareholders (0.3) (1.8)     (0.8) (2.7)
Pension            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Other 0.0 1.4     0.0 1.4
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)     (0.6) (0.6)
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 0.1     0.2 0.2
Postretirement            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Other   0.0     0.0 0.0
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 (0.3)     0.0 (0.7)
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 (0.3) (0.2)     (0.6) (0.6)
Other $ 0.0 $ (1.4)     $ 0.0 $ (1.4)