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Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Balance |  | $ 419.9 | $ 408.9 | $ 436.1 | $ 402.2
Balance |  | 432.1 | 441.5 | 432.1 | 441.5
Pension and Other Postretirement Benefits Plans Cost |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Balance |  | (66.1) | (63.5) | (66.4) | (63.7)
Other comprehensive income (loss) before reclassifications |  | 0.0 | 0.0 | 0.0 | 0.0
Amortization of net actuarial loss | [1] | 0.4 | 0.3 | 0.8 | 0.6
Reclassification of translation adjustment |  |  | 0.0 |  | 0.0
Less: Income tax expense |  | 0.1 | 0.1 | 0.2 | 0.2
Reclassifications, net of tax |  | 0.3 | 0.2 | 0.6 | 0.4
Net change in accumulated other comprehensive loss |  | 0.3 | 0.2 | 0.6 | 0.4
Balance |  | (65.8) | (63.3) | (65.8) | (63.3)
Translation Adjustments |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Balance |  | (15.2) | (14.7) | (15.5) | (14.2)
Other comprehensive income (loss) before reclassifications |  | 1.4 | (0.5) | 1.7 | (1.0)
Amortization of net actuarial loss | [1] | 0.0 | 0.0 | 0.0 | 0.0
Reclassification of translation adjustment |  |  | 0.5 |  | 0.5
Less: Income tax expense |  | 0.0 | 0.1 | 0.0 | 0.1
Reclassifications, net of tax |  | 0.0 | 0.4 | 0.0 | 0.4
Net change in accumulated other comprehensive loss |  | 1.4 | (0.1) | 1.7 | (0.6)
Balance |  | (13.8) | (14.8) | (13.8) | (14.8)
Accumulated Other Comprehensive Loss |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Balance |  | (81.3) | (78.2) | (81.9) | (77.9)
Other comprehensive income (loss) before reclassifications |  | 1.4 | (0.5) | 1.7 | (1.0)
Amortization of net actuarial loss | [1] | 0.4 | 0.3 | 0.8 | 0.6
Reclassification of translation adjustment |  |  | 0.5 |  | 0.5
Less: Income tax expense |  | 0.1 | 0.2 | 0.2 | 0.3
Reclassifications, net of tax |  | 0.3 | 0.6 | 0.6 | 0.8
Net change in accumulated other comprehensive loss |  | 1.7 | 0.1 | 2.3 | (0.2)
Balance |  | $ (79.6) | $ (78.1) | $ (79.6) | $ (78.1)
[1] | These accumulated other comprehensive loss components are included in the calculation of net periodic pension and other postretirement benefits plans expense (income) recognized in investment and other loss (income), net on the Unaudited Condensed Consolidated Statements of Operations (see Note 6, Retirement Plans).

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