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Income Taxes - Schedule of Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Accruals not currently deductible for tax purposes | $ 199.7 | $ 285.8
Inventory | 44.3 | 83.9
Postretirement and pension liabilities | 71.7 | 149.8
Net operating losses | 376.4 | 361.3
Foreign tax credits | 7.5 | 34.0
Other | 145.0 | 193.0
Total gross deferred tax assets | 873.6 | 1,151.8
Less valuation allowance | (294.8) | (325.3)
Net deferred tax assets after valuation allowance | 578.8 | 826.5
Deferred tax liabilities: |  |
Accelerated depreciation | (108.3) | (159.5)
Amortizable intangibles | (3,572.2) | (5,300.5)
Other | (35.8) | (35.0)
Total gross deferred tax liabilities | (3,734.6) | (5,814.0)
Outside Basis DIfferences [Member] |  |
Deferred tax liabilities: |  |
Other | (18.3) | (319.0)
Postretirement Liabilities [Member] |  |
Deferred tax assets: |  |
Postretirement and pension liabilities | 29.0 | 44.0
Balance Sheet Item [Member] |  |
Deferred tax liabilities: |  |
Net deferred tax liabilities | $ (3,155.8) | $ (4,987.5)

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