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Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Predecessor
Property, Plant and Equipment
Full cost ceiling limitation impairment		$ 108.4
Predecessor | Repsol E and P USA, Inc.
Property, Plant and Equipment
Carry commitment costs incurred		5.2
Predecessor | Drilling Carry Costs | Repsol E and P USA, Inc.
Property, Plant and Equipment
Drilling and completion costs carried		$ 31.0
Successor | Repsol E and P USA, Inc.
Property, Plant and Equipment
Settlement of carry commitment			$ 1.2
Drilling And Oilfield Services Assets | Successor
Property, Plant and Equipment
Net realizable value of assets held for sale	$ 4.4
Impairment of assets to be disposed of	$ 2.5

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- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(4)(ii))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

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