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Income Taxes - Deferred Tax Asset and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss | $ 77.3 | $ 64.8
Property, net | 36.3 | 52.1
Insurance reserve | 19.9 | 32.0
Stock-based compensation | 19.5 | 23.7
Allowance for doubtful accounts | 14.0 | 19.3
Alternative minimum tax | 0.0 | 7.5
Carrying value of partnerships | 0.0 | 12.9
Other accruals | 20.4 | 26.1
Tax credits | 2.8 | 2.6
Noncontrolling interest | 26.3 | 14.8
Other | 0.5 | 0.8
Total deferred income tax assets | 217.0 | 256.6
Less: Valuation allowance | (35.8) | (27.9)
Net deferred income tax assets | 181.2 | 228.7
Deferred income tax liabilities: |  |
Deferred revenue | (28.9) | 0.0
Intangibles | (80.0) | (113.2)
Convertible debt interest | 0.0 | (38.1)
Carrying value of partnerships | (6.2) | 0.0
Other | (2.5) | (1.6)
Total deferred income tax liabilities | (117.6) | (152.9)
Net deferred income tax assets | $ 63.6 | $ 75.8

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