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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Reserves and accrued expenses | $ 156.5 | $ 121.5
Inventories | 4.5 | 5.1
Net operating loss carryforwards | 67.9 | 71.8
R&D credits | 6.1 | 9.6
Valuation allowance | (26.4) | (25.7)
Outside basis difference on investments held for sale | 2.7 | 0.0
Total deferred tax assets | 211.3 | 182.3
Deferred tax liabilities: |  |
Reserves and accrued expenses | 14.3 | 39.6
Amortizable intangible assets | 1,043.0 | 935.9
Plant and equipment | 6.6 | 5.7
Accrued tax on unremitted foreign earnings | 16.3 | 0.0
Outside basis difference on investments held for sale | 10.0 | 0.0
Total deferred tax liabilities | $ 1,090.2 | $ 981.2

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