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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (33.5) $ (39.1) $ (33.3) $ (42.6)
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) 3.5    
Pension Plan [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (46.5) (39.4) (46.5) (42.8)
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 0.0 3.5    
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 13.0 0.3 $ 13.3 $ 0.3
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 $ (0.3) $ 0.0