v3.25.4
Nature of Operations and Significant Accounting Policies (Amounts Reclassified out of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items $ 8.7 $ 4.4 $ 0.3
Income from continuing operations before income taxes 432.8 338.5 233.1
Tax impact 101.1 70.3 57.2
Net income from continuing operations attributable to common shareholders 366.6 294.7 255.9
Amount Reclassified from Accumulated Other Comprehensive Loss | Pension and Postretirement      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Income from continuing operations before income taxes 14.5 15.4 15.6
Tax impact 3.7 3.4 4.0
Net income from continuing operations attributable to common shareholders 10.8 12.0 11.6
Pension | Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items   0.7 0.7
Pension | Amount Reclassified from Accumulated Other Comprehensive Loss | Net gain (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items   15.1 15.5
Postretirement | Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items $ 0.0 0.0 (0.3)
Postretirement | Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs | Discontinued Operations      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items     0.3
Postretirement | Amount Reclassified from Accumulated Other Comprehensive Loss | Net gain (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items   $ (0.4) (0.3)
Postretirement | Amount Reclassified from Accumulated Other Comprehensive Loss | Net gain (loss) | Discontinued Operations      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amortization of pension and postretirement items     $ 0.1