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Income Taxes (Details 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Reorganization Items |  | $ 33.9 | $ 29.7 | $ 95.4 | $ 159.0 | $ 159.0 | $ 0.0 | $ 0.0
Deferred Tax Assets, Valuation Allowance, Current |  | 0.0 |  |  | 0.0 | 0.0 | 49.7 |
Deferred tax assets: |  |  |  |  |  |  |  |
Tax credits and loss carryforwards |  | 4,284.4 |  |  | 4,284.4 | 4,284.4 | 1,817.4 |
Accrued postretirement benefit obligations |  | 364.5 |  |  | 364.5 | 364.5 | 372.4 |
Asset retirement obligations |  | 163.6 |  |  | 163.6 | 163.6 | 160.9 |
Employee benefits |  | 57.0 |  |  | 57.0 | 57.0 | 69.6 |
Payable to voluntary employee beneficiary association for certain Patriot retirees | [1] | 0.0 |  |  | 0.0 | 0.0 | 52.9 |
Hedge activities |  | 21.0 |  |  | 21.0 | 21.0 | 26.6 |
Financial guarantees |  | 77.9 |  |  | 77.9 | 77.9 | 16.9 |
Workers' compensation obligations |  | 7.5 |  |  | 7.5 | 7.5 | 13.7 |
Other |  | 2.1 |  |  | 2.1 | 2.1 | 66.7 |
Total gross deferred tax assets |  | 4,978.0 |  |  | 4,978.0 | 4,978.0 | 2,597.1 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments |  | 900.4 |  |  | 900.4 | 900.4 | 966.6 |
Unamortized discount on Convertible Junior Subordinated Debentures |  | 127.7 |  |  | 127.7 | 127.7 | 130.3 |
Investments and other assets |  | 86.3 |  |  | 86.3 | 86.3 | 70.1 |
Total gross deferred tax liabilities |  | 1,114.4 |  |  | 1,114.4 | 1,114.4 | 1,167.0 |
Valuation allowance, income tax |  | (4,037.5) |  |  | (4,037.5) | (4,037.5) | (1,614.1) |
Net deferred tax liability |  | (173.9) |  |  | (173.9) | (173.9) | (184.0) |
Deferred taxes are classified as follows: |  |  |  |  |  |  |  |
Noncurrent deferred income taxes |  | (173.9) |  |  | (173.9) | (173.9) | (233.7) |
Net deferred tax liability |  | $ (173.9) |  |  | $ (173.9) | $ (173.9) | $ (184.0) |
[1] | Refer to Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to this transaction.

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