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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (34.4) $ (30.7) $ (34.5) $ (30.7)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.1 (0.1)    
Pension Plan [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (47.5) (41.9) (47.8) (42.0)
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.3 0.1    
Other Postretirement Benefits Plan [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 13.2 11.2 $ 13.4 $ 11.3
Other Postretirement Benefits Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (0.2) $ (0.1)