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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 736.3 $ 739.3 $ 731.6 $ 711.8 $ 691.4 $ 686.5 $ 731.6 $ 686.5
Other comprehensive income (loss) before reclassifications, before income tax             (0.3) (0.5)
Amounts reclassified from accumulated other comprehensive income (loss), before income tax             (3.6) (3.7)
Amounts deferred to accumulated other comprehensive income (loss),before income tax             0.0 1.2
Tax effect (0.1)     0.2     (0.1) 0.0
Other comprehensive income (loss), net of tax (1.2) (1.7) (1.1) (1.8) (0.6) (0.6) (4.0) (3.0)
Ending balance 712.7 736.3 739.3 730.3 711.8 691.4 712.7 730.3
Foreign Currency Translation Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance     (6.5)     (6.8) (6.5) (6.8)
Other comprehensive income (loss) before reclassifications, before income tax             (0.3) (0.5)
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             (0.3) (0.5)
Ending balance (6.8)     (7.3)     (6.8) (7.3)
Pension and Postretirement Liability Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance     18.9     21.5 18.9 21.5
Other comprehensive income (loss) before reclassifications, before income tax             0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss), before income tax             (3.6) (3.7)
Amounts deferred to accumulated other comprehensive income (loss),before income tax             0.0 1.2
Tax effect             (0.1) 0.0
Other comprehensive income (loss), net of tax             (3.7) (2.5)
Ending balance 15.2     19.0     15.2 19.0
Accumulated Other Comprehensive Income (Loss)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 9.6 11.3 12.4 13.5 14.1 14.7 12.4 14.7
Other comprehensive income (loss), net of tax (1.2) (1.7) (1.1) (1.8) (0.6) (0.6)    
Ending balance $ 8.4 $ 9.6 $ 11.3 $ 11.7 $ 13.5 $ 14.1 $ 8.4 $ 11.7