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Income Tax Provision - Effect of Temporary Differences Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax liabilities: |  |
Depreciation | $ (69.5) | $ (75.0)
Inventory | 0.0 | 0.0
Prepaid insurance | (1.3) | (1.9)
Leases - right-of-use asset | (2.8) | (2.8)
Deferred tax liabilities | (73.6) | (79.7)
Deferred tax assets: |  |
Tax loss carryforwards | 15.6 | 16.0
Pension and postretirement benefits | 41.2 | 46.8
Other employee benefit accruals | 8.4 | 8.0
Lease liability | 2.8 | 2.8
State decoupling | 1.2 | 1.2
Capital loss carryforward | 0.8 | 0.8
Intangible assets | 0.1 | 0.1
Inventory | 0.8 | 0.8
Allowance for doubtful accounts | 0.4 | 0.5
Capitalized R&D | 3.0 | 3.2
Other, net | 0.0 | 0.0
Deferred tax assets subtotal | 74.3 | 80.2
Valuation allowances | (15.0) | (15.5)
Deferred tax assets | 59.3 | 64.7
Net deferred tax assets (liabilities) | $ (14.3) | $ (15.0)

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