v3.25.4
Retirement and Postretirement Plans - Allocation of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets $ 443.1 $ 396.6 $ 525.6
Pension | Level 1, 2 and 3      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 236.1 205.5  
Pension | Level 1, 2 and 3 | Cash and cash equivalents      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 11.1 12.6  
Pension | Level 1, 2 and 3 | U.S government and agency securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 43.1 36.3  
Pension | Level 1, 2 and 3 | Mutual fund - equities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 96.1 80.9  
Pension | Level 1, 2 and 3 | Mutual fund - fixed income      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 14.8 12.5  
Pension | Level 1, 2 and 3 | Mutual fund - tactical tilt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 12.8 10.8  
Pension | Level 1, 2 and 3 | Equity securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 1.4 0.5  
Pension | Level 1, 2 and 3 | Real estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 23.1 29.7  
Pension | Level 1, 2 and 3 | Private debt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 33.7 22.2  
Pension | Level 1      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 171.0 144.3  
Pension | Level 1 | Cash and cash equivalents      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 2.8 3.3  
Pension | Level 1 | U.S government and agency securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 43.1 36.3  
Pension | Level 1 | Mutual fund - equities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 96.1 80.9  
Pension | Level 1 | Mutual fund - fixed income      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 14.8 12.5  
Pension | Level 1 | Mutual fund - tactical tilt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 12.8 10.8  
Pension | Level 1 | Equity securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 1.4 0.5  
Pension | Level 1 | Real estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0 0.0  
Pension | Level 1 | Private debt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0 0.0  
Pension | Level 2      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 8.3 9.3  
Pension | Level 2 | Cash and cash equivalents      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 8.3 9.3  
Pension | Level 2 | U.S government and agency securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0 0.0  
Pension | Level 2 | Equity securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0    
Pension | Level 2 | Real estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0 0.0  
Pension | Level 2 | Private debt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0 0.0  
Pension | Level 3      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 56.8 51.9  
Pension | Level 3 | Cash and cash equivalents      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0    
Pension | Level 3 | U.S government and agency securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0    
Pension | Level 3 | Equity securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.0    
Pension | Level 3 | Real estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 23.1 29.7  
Pension | Level 3 | Private debt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 33.7 22.2  
Pension | Assets measured at net asset value      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets $ 207.0 $ 191.1  
Redemption period 90 days 90 days  
Postretirement      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets $ 45.9 $ 49.4 $ 53.8
Postretirement | Level 1, 2 and 3      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 23.0 25.3  
Postretirement | Level 1, 2 and 3 | Cash and cash equivalents      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 2.5 3.6  
Postretirement | Level 1, 2 and 3 | Mutual fund - equities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 11.3 11.9  
Postretirement | Level 1, 2 and 3 | Mutual fund - fixed income      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 6.2 6.6  
Postretirement | Level 1, 2 and 3 | Mutual fund - tactical tilt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 2.1 2.3  
Postretirement | Level 1, 2 and 3 | Real estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.9 0.9  
Postretirement | Level 1      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 23.0 25.3  
Postretirement | Level 1 | Cash and cash equivalents      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 2.5 3.6  
Postretirement | Level 1 | Mutual fund - equities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 11.3 11.9  
Postretirement | Level 1 | Mutual fund - fixed income      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 6.2 6.6  
Postretirement | Level 1 | Mutual fund - tactical tilt      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 2.1 2.3  
Postretirement | Level 1 | Real estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets 0.9 0.9  
Postretirement | Assets measured at net asset value      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total Assets $ 22.9 $ 24.1