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Income Taxes - Deferred Tax Asset and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred income tax assets: |  |  |
Net operating loss | $ 64.8 |  | $ 161.1
Property, net | 52.1 |  | 48.2
Insurance reserve | 32.0 |  | 26.0
Stock-based compensation | 23.7 |  | 23.4
Allowance for doubtful accounts | 19.3 | $ 7.0 | 24.5
Alternative minimum tax | 7.5 |  | 10.6
Carrying value of partnerships | 12.9 |  | 22.1
Other accruals | 26.1 |  | 25.7
Tax credits | 2.6 |  | 14.0
Noncontrolling interest | 14.8 |  | 10.6
Other | 0.8 |  | 0.8
Total deferred income tax assets | 256.6 |  | 367.0
Less: Valuation allowance | (27.9) |  | (27.6)
Net deferred income tax assets | 228.7 |  | 339.4
Deferred income tax liabilities: |  |  |
Intangibles | (113.2) |  | (112.8)
Convertible debt interest | (38.1) |  | (35.3)
Other | (1.6) |  | (0.5)
Total deferred income tax liabilities | (152.9) |  | (148.6)
Net deferred income tax assets | $ 75.8 |  | $ 190.8

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