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Income Taxes Tax Effects of Temorpary Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Successor |  |
Tax Effects of Temporary Differences on Deferred Tax Assets and Liabilities [Line Items] |  |
Deferred Income Taxes and Other Assets, Noncurrent | $ 85.6 |
Deferred tax assets: |  |
Deferred Tax Assets, Operating Loss Carryforwards | 2,068.0 |
Deferred Tax Assets, Property, Plant and Equipment | 463.8 |
Accrued postretirement benefit obligations | 194.2 |
Asset retirement obligations | 30.6 |
Deferred Tax Assets Financial Guarantee | 2.0 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | 25.3 |
Deferred Tax Asset, Payments to the VEBA to settle the accumulated postretirement healthcare benefit obligations | 27.2 |
Deferred Tax Assets, Investments | 10.5 |
Deferred Tax Assets, Derivative Instruments | 137.2 |
Workers’ compensation obligations | 6.4 |
Other | 16.1 |
Total gross deferred tax assets | 2,981.3 |
Valuation allowance, income tax | (2,432.5) |
Deferred Tax Assets, Net of Valuation Allowance | 548.8 |
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 353.3 |
Unamortized discount on Convertible Junior Subordinated Debentures | 0.0 |
Deferred Tax Liabilities Coal Supply Agreements | 29.6 |
Investments and other assets | 85.7 |
Deferred Tax Liabilities, Gross | 468.6 |
Deferred taxes are classified as follows: |  |
Deferred Income Taxes and Other Tax Liabilities, Noncurrent | (5.4) |
Deferred Tax Assets, Net | $ (80.2) |
Predecessor |  |
Tax Effects of Temporary Differences on Deferred Tax Assets and Liabilities [Line Items] |  |
Deferred Income Taxes and Other Assets, Noncurrent |  | $ 0.0
Deferred tax assets: |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | 4,284.4
Deferred Tax Assets, Property, Plant and Equipment |  | 424.4
Accrued postretirement benefit obligations |  | 364.5
Asset retirement obligations |  | 163.6
Deferred Tax Assets Financial Guarantee |  | 77.9
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits |  | 57.0
Deferred Tax Asset, Payments to the VEBA to settle the accumulated postretirement healthcare benefit obligations |  | 0.0
Deferred Tax Assets, Investments |  | 21.0
Deferred Tax Assets, Derivative Instruments |  | 0.0
Workers’ compensation obligations |  | 7.5
Other |  | 2.1
Total gross deferred tax assets |  | 5,402.4
Valuation allowance, income tax |  | (4,037.5)
Deferred Tax Assets, Net of Valuation Allowance |  | 1,364.9
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments |  | 1,324.8
Unamortized discount on Convertible Junior Subordinated Debentures |  | 127.7
Deferred Tax Liabilities Coal Supply Agreements |  | 0.0
Investments and other assets |  | 86.3
Deferred Tax Liabilities, Gross |  | 1,538.8
Deferred taxes are classified as follows: |  |
Deferred Income Taxes and Other Tax Liabilities, Noncurrent |  | (173.9)
Deferred Tax Liabilities, Net |  | $ (173.9)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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