Income Taxes - Components of Net Deferred Tax Liability (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Tax effect of temporary differences related to:
Inventories	$ 5.4us-gaap_DeferredTaxAssetsInventory	$ 4.4us-gaap_DeferredTaxAssetsInventory
Accrued OPEB costs	4.8	4.6
Accrued pension costs	52.0	21.8
Accrued environmental liabilities	38.8	40.1
Other deductible differences	40.3	58.8
Tax loss and tax credit carryforwards	163.6	191.8
Valuation allowance	(0.1)	(0.1)
Adjusted gross deferred tax assets (liabilities)	304.8us-gaap_DeferredTaxAssetsNet	321.4us-gaap_DeferredTaxAssetsNet
Netting of items by tax jurisdiction, assets	(127.0)	(149.2)
Total	177.8us-gaap_DeferredTaxAssetsLiabilitiesNet	172.2us-gaap_DeferredTaxAssetsLiabilitiesNet
Less net current deferred tax asset (liability)	13.4	23.0
Net noncurrent deferred tax asset (liability)	164.4	149.2
Tax effect of temporary differences related to:
Inventories	(5.2)	(2.6)
Marketable securities	(126.4)	(145.8)
Property and equipment	(109.2)	(115.8)
Other taxable differences	(21.6)us-gaap_DeferredTaxLiabilitiesOther	(35.1)us-gaap_DeferredTaxLiabilitiesOther
Investments in subsidiaries and affiliates	(278.7)	(280.6)
Tax on unremitted earnings of non-U.S. subsidiaries	(2.6)	(2.6)
Adjusted gross deferred tax assets (liabilities)	(543.7)us-gaap_DeferredIncomeTaxLiabilities	(582.5)us-gaap_DeferredIncomeTaxLiabilities
Netting of items by tax jurisdiction, liabilities	127.0	149.2
Total	(416.7)us-gaap_DeferredTaxLiabilities	(433.3)us-gaap_DeferredTaxLiabilities
Less net current deferred tax asset (liability)	(3.9)us-gaap_DeferredTaxLiabilitiesCurrent	(2.2)us-gaap_DeferredTaxLiabilitiesCurrent
Net noncurrent deferred tax asset (liability)	$ (412.8)	$ (431.1)

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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