Fresh-Start Accounting - All Other Adjustments (Details) - Fresh-Start Adjustments $ in Millions	Feb. 28, 2017 USD ($)
Reorganization Items [Line Items]
Increase in greenhouse gas allowances	$ 30.0
Joint venture investment	1.0
Increase in greenhouse gas emissions liabilities	4.0
Increase (decrease) in asset retirement obligations	30.0
Increase (decrease) in intangible liabilities	6.0
Increase in greenhouse gas emissions liabilities	19.0
Change from entitlements method to sales method
Reorganization Items [Line Items]
Change in accounting policy for gas production imbalances	0.2
Increase (decrease) in current portion of intangible liabilities	$ 0.5

Increase (Decrease) in Allowance for Environmental Gas Emissions

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Increase (Decrease) in Environmental Gas Emissions, Current Liabilities

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Increase (Decrease) in Environmental Gas Emissions, Noncurrent Liabilities

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Increase (Decrease) in Intangible Liabilities

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Increase (Decrease) in Intangible Liabilities, Current

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[Line Items] for Reorganization Items [Table]

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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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Change in the balance of the gas balancing receivable account. Gas imbalances occur when the entity sells more or less than its entitled ownership percentage of total gas production. If the entity receives less than it is entitled, the underproduction is recorded as a receivable.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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