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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