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Income Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Tax effect of temporary differences related to:    
Inventories $ 6.2 $ 4.7
Property and equipment 5.9  
Accrued OPEB costs 2.8 2.8
Accrued pension costs 80.6 75.5
Accrued environmental liabilities 33.8 35.8
Other deductible differences 8.3 10.3
Investments in subsidiaries and affiliates 2.6 2.6
Tax loss and tax credit carryforwards 91.2 93.9
Valuation allowance (14.2) (10.0)
Adjusted gross deferred tax assets 217.2 215.6
Netting of items by tax jurisdiction, assets (111.2) (114.6)
Net noncurrent deferred tax asset (liability) 106.0 101.0
Tax effect of temporary differences related to:    
Inventories (2.5) (3.3)
Marketable securities (0.3) (0.2)
Property and equipment (67.9) (69.0)
Other taxable differences (13.4) (13.2)
Investments in subsidiaries and affiliates (54.4) (58.8)
Tax on unremitted earnings of non-U.S. subsidiaries (10.8) (11.3)
Adjusted gross deferred tax liabilities (149.3) (155.8)
Netting of items by tax jurisdiction, liabilities (111.2) (114.6)
Net noncurrent deferred tax asset (liability) $ (38.1) $ (41.2)