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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)