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Income Taxes - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Net operating loss carryforwards | $ 67.8 | $ 65.1
Unfunded pension liability and other postretirement obligations | 1.7 | 0.5
ASC 606 - revenue from contracts with customers | 9.3 |
Tax credit carryforwards | 8.1 | 10.8
Stock based compensation | 8.4 | 7.1
Other comprehensive income | 4.1 | 0.2
Reserves and other | 15.6 | 13.5
Subtotal | 115.0 | 97.2
Valuation allowance | (48.8) | (54.9)
Total assets | 66.2 | 42.3
Liabilities |  |
Accelerated depreciation | (163.0) | (144.1)
Accelerated amortization | (11.8) | (11.3)
Other | (4.0) | (1.3)
Total liabilities | (178.8) | (156.7)
Net deferred tax (liabilities) assets | $ (112.6) | $ (114.4)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from unrealized gains on items in other comprehensive income which can only be deducted for tax purposes when the gains are realized and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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