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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Before Tax Effect of Derivative Instruments in Statement of Operations (Details) - Predecessor
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
Increase in oil revenue owing to effective hedging contracts $ 9.3
increase in gas revenue owing to effective hedging contracts 3.5
Designated as Hedging Instrument | Cash Flow Hedging  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 4.6
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) 12.8
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0.1
Designated as Hedging Instrument | Cash Flow Hedging | Commodity contracts  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 4.6
Designated as Hedging Instrument | Cash Flow Hedging | Commodity contracts | Operating revenue - oil/natural gas production  
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) 12.8
Designated as Hedging Instrument | Cash Flow Hedging | Commodity contracts | Derivative income (expense), net  
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) $ 0.1