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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

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