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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 690.5 $ 731.6
Other comprehensive income (loss) before reclassifications, before income tax 0.4 0.0
Amounts reclassified from accumulated other comprehensive income (loss), before income tax (1.2) (1.1)
Amounts deferred to accumulated other comprehensive income (loss),before income tax 0.0 0.0
Tax effect (0.1) 0.0
Other comprehensive income (loss), net of tax (0.9) (1.1)
Ending balance 686.1 739.3
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (7.7) (6.5)
Other comprehensive income (loss) before reclassifications, before income tax 0.4 0.0
Amounts reclassified from accumulated other comprehensive income (loss), before income tax 0.0 0.0
Amounts deferred to accumulated other comprehensive income (loss),before income tax 0.0 0.0
Tax effect 0.0 0.0
Other comprehensive income (loss), net of tax 0.4 0.0
Ending balance (7.3) (6.5)
Pension and Postretirement Liability Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 15.4 18.9
Other comprehensive income (loss) before reclassifications, before income tax 0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss), before income tax (1.2) (1.1)
Amounts deferred to accumulated other comprehensive income (loss),before income tax 0.0 0.0
Tax effect (0.1) 0.0
Other comprehensive income (loss), net of tax (1.3) (1.1)
Ending balance 14.1 17.8
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 7.7 12.4
Other comprehensive income (loss), net of tax (0.9) (1.1)
Ending balance $ 6.8 $ 11.3