v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Other Nonoperating Income (Expense) $ (1.8) $ 3.1 $ (1.6) $ 2.1
Income from continuing operations before income taxes 128.0 104.6 213.1 203.4
Tax impact 32.1 24.3 50.1 44.8
Net income attributable to common shareholders 95.9 86.4 163.0 193.5
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 6.4 7.2
Tax impact 0.8 0.9 1.6 1.8
Net income attributable to common shareholders 2.4 2.7 4.8 5.4
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 0.4 0.4
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 6.2 7.0
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) $ (0.2) $ (0.2)