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Shareholders' Equity (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest expense $ (33.0) $ (39.8) $ (35.3)
Tax impact (91.6) (82.2) (74.5)
Amortization of net actuarial loss (gain) 0.2 (0.1) $ (0.5)
Derivative Gain (Loss) [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Total (income), net of tax [1],[2] (0.2) (4.1)  
Pension And Postretirement Adjustments [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Total (income), net of tax [1] 2.6 (2.8)  
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative Gain (Loss) [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Tax impact 0.0 1.4  
Total (income), net of tax (0.2) (4.1)  
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative Gain (Loss) [Member] | Interest Rate Swap Contracts, Before Tax [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest expense (0.2) (5.5)  
Reclassification From Accumulated Other Comprehensive Loss [Member] | Prior Service Credit Amortization [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amortization of net actuarial loss (gain) (0.1) (0.2)  
Reclassification From Accumulated Other Comprehensive Loss [Member] | Amortization of Net Actuarial Loss [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amortization of net actuarial loss (gain) 3.7 (3.4)  
Reclassification From Accumulated Other Comprehensive Loss [Member] | Pension And Postretirement Adjustments [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Tax impact (1.0) 0.8  
Total loss (income), before tax 3.6 (3.6)  
Total loss (income), net of tax 2.6 (2.8)  
Total reclassifications for the period $ 2.4 $ (6.9)  
[1] Amounts are net of tax.
[2] Amounts include our 50% share of AOCL components from our WAVE joint venture.