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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Gains or Losses Related to Changes in Fair Value and Cash Settlements on Derivatives Not Qualifying as Hedging Instruments (Details) - Not Designated as Hedging Instrument - Commodity contracts - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 4 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Cash settlements   $ 1.3 $ 1.4
Change in fair value   4.2 6.7
Total gains (losses) on non-qualifying hedges   $ 5.5 $ 8.1
Predecessor      
Derivative Instruments, Gain (Loss) [Line Items]      
Cash settlements $ 0.0    
Change in fair value (1.8)    
Total gains (losses) on non-qualifying hedges $ (1.8)