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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Before Tax Effect of Derivative Instruments in Statement of Operations (Details) - Predecessor - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Increase in oil revenue owing to effective hedging contracts $ 5.3 $ 19.7
increase in gas revenue owing to effective hedging contracts 2.4 9.7
Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives 2.3 (1.7)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) 7.7 29.4
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) (0.2) (0.7)
Designated as Hedging Instrument | Cash Flow Hedging | Commodity contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives 2.3 (1.7)
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) 7.7 29.4
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) $ (0.2) $ (0.7)