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Income Taxes Tax Effects of Temorpary Differences on Deferred Tax Assets and Liabilities (Details) - Successor - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred tax assets: |  |
Tax loss carryforwards and credits | $ 1,729.3 | $ 2,068.0
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 304.5 | 463.8
Accrued postretirement benefit obligations | 139.5 | 194.2
Asset retirement obligations | 47.2 | 30.6
Employee benefits | 24.8 | 25.3
Take or pay obligations | 17.1 | 27.2
Investments and other assets | 82.7 | 137.2
Workers’ compensation obligations | 6.2 | 6.4
Other | 38.2 | 28.6
Total gross deferred tax assets | 2,389.5 | 2,981.3
Valuation allowance, income tax | (2,094.3) | (2,432.5)
Total deferred tax assets | 295.2 | 548.8
Deferred tax liabilities: |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 203.4 | 353.3
Coal supply agreements | 9.3 | 29.6
Investments and other assets | 43.7 | 85.7
Total deferred tax liabilities | 256.4 | 468.6
Net deferred tax asset | 38.8 | 80.2
Deferred taxes are classified as follows: |  |
Noncurrent deferred income tax asset | 48.5 | 85.6
Noncurrent deferred income tax liability | (9.7) | (5.4)
Net deferred tax asset | $ 38.8 | $ 80.2

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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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