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Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | May 31, 2015
Predecessor |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Full cost ceiling limitation impairment |  | $ 251.0 |  | $ 359.4 |  |  |
Predecessor | Repsol E and P USA, Inc. |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Carry commitment costs incurred |  | $ 1.0 |  | $ 6.2 |  |  |
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 |  |
Held-for-sale | Drilling And Oilfield Services Assets | Successor |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Impairment of assets to be disposed of | $ 0.4 |  | $ 3.0 |  |  |  |
Disposed of by Sale | Drilling And Oilfield Services Assets | Successor |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Long-lived assets disposed of | $ 0.7 |  |  |  |  |  |

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition 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. + References 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=82851474&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869 + Details
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