v3.26.1
Changes in Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other Nonoperating Income (Expense) $ 0.2 $ (1.0)
Income from continuing operations before income taxes 85.1 98.8
Tax impact 18.0 20.5
Net income attributable to common shareholders 67.1 107.1
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension and Postretirement Items    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Income from continuing operations before income taxes 3.2 3.6
Tax impact 0.8 0.9
Net income attributable to common shareholders 2.4 2.7
Pension | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other Nonoperating Income (Expense) 0.2 0.2
Pension | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other Nonoperating Income (Expense) 3.1 3.5
Postretirement | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other Nonoperating Income (Expense) $ (0.1) $ (0.1)