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Income taxes - Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Tax effect of temporary differences related to:    
Lease assets $ 5.3 $ 5.0
Accrued OPEB costs 2.0 2.8
Accrued pension costs 22.0 74.1
Accrued environmental liabilities 25.9 28.5
Other deductible differences 12.0 9.3
Investments in subsidiaries and affiliates 6.7 7.3
Tax loss and tax credit carryforwards 82.6 89.4
Valuation allowance (16.5) (18.4)
Adjusted gross deferred tax assets 140.0 198.0
Netting of items by tax jurisdiction, assets (99.5) (111.2)
Net noncurrent deferred tax asset (liability) 40.5 86.8
Tax effect of temporary differences related to:    
Inventories (5.3) (2.5)
Property and equipment (62.8) (70.4)
Lease liabilities (5.4) (5.1)
Other taxable differences (15.8) (15.5)
Investments in subsidiaries and affiliates (62.3) (52.7)
Tax on unremitted earnings of non-U.S. subsidiaries (11.4) (11.2)
Adjusted gross deferred tax liabilities (163.0) (157.4)
Netting of items by tax jurisdiction, liabilities 99.5 111.2
Net noncurrent deferred tax asset (liability) $ (63.5) $ (46.2)