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Income Taxes - Schedule of Effect of Temporary Differences Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Deferred tax assets: |  |
Accrued postretirement benefits cost | $ 7.9 | $ 8.0
Accrued pension cost | 39.3 | 44.1
Other employee benefit accruals | 10.7 | 14.3
Tax loss and credit carryforwards | 89.1 | 84.9
Other, net | 75.9 | 58.3
Valuation allowances | (48.7) | (39.3)
Total deferred tax assets | 174.2 | 170.3
Deferred tax liabilities - principally depreciation and amortization | (308.2) | (312.5)
Net deferred tax liabilities | $ (134.0) | $ (142.2)

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