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Income Taxes - Deferred Tax Asset and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss | $ 66.0 | $ 77.3
Property, net | 30.8 | 36.3
Insurance reserve | 16.8 | 19.9
Stock-based compensation | 33.0 | 19.5
Revenue reserves | 6.1 | 14.0
Other accruals | 22.5 | 20.4
Tax credits | 4.7 | 2.8
Other | 0.6 | 0.5
Total deferred income tax assets | 180.5 | 190.7
Less: Valuation allowance | (33.7) | (35.8)
Net deferred income tax assets | 146.8 | 154.9
Deferred income tax liabilities: |  |
Deferred revenue | 0.0 | (28.9)
Intangibles | (88.5) | (80.0)
Carrying value of partnerships | (15.2) | (11.4)
Other | (0.2) | (0.2)
Total deferred income tax liabilities | (103.9) | (120.5)
Net deferred income tax assets | $ 42.9 | $ 34.4

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