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Income Taxes - Schedule of Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |
Accruals not currently deductible for tax purposes | $ 147.5 | $ 173.0
Inventory | 31.6 | 34.6
Postretirement liabilities | 28.0 | 24.0
Pension liabilities | 53.6 | 49.4
Net operating losses | 355.1 | 374.0
Foreign tax credits | 133.3 | 7.5
Other | 123.9 | 137.3
Total gross deferred tax assets | 873.0 | 799.8
Less valuation allowance | (195.0) | (293.0)
Net deferred tax assets after valuation allowance | 678.0 | 506.8
Deferred tax liabilities: |  |
Accelerated depreciation | (87.2) | (59.0)
Amortizable intangibles | (1,405.4) | (2,801.6)
Outside basis differences | (13.1) | (18.3)
Other | (49.0) | (35.6)
Total gross deferred tax liabilities | (1,554.7) | (2,914.5)
Net deferred tax liabilities | $ (876.7) | $ (2,407.7)

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