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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |
Document Fiscal Year Focus | 2018 |
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset | $ 131.2 | $ 99.7
Amount of change in deferred tax assets valuation allowance | 1.0 |
Deferred tax assets: |  |
Accrued compensation, principally post-retirement, and other employee benefits | 15.1 | 13.7
Accrued expenses, principally for state income taxes, interest, and warranty | 4.6 | 5.9
Net operating loss and other carryforwards | 155.9 | 115.6
Inventories, principally due to reserves for financial reporting purposes and capitalization for tax purposes | 3.9 | 3.6
Convertible Note Hedges | 5.7 | 7.3
Plant and equipment, principally due to differences in depreciation | 9.4 | 9.6
Total gross deferred tax assets | 194.6 | 155.7
Valuation allowance | (131.2) | (99.7)
Total deferred tax assets | 63.4 | 56.0
Deferred tax liabilities: |  |
Intangible assets, principally due to different tax and financial reporting bases and amortization lives | (8.7) | (10.3)
Debt discount on convertible notes | (4.4) | (5.7)
Other liabilities | (37.2) | (17.6)
Total gross deferred tax liabilities | (50.3) | (33.6)
Classified as follows in the Consolidated Balance Sheets: |  |
Other assets and deferred charges (non-current deferred tax assets) | 15.2 | 22.4
Deferred income taxes (non-current deferred tax liabilities) | (2.1) | 0.0
Net deferred tax asset | $ 13.1 | $ 22.4

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