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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income Loss
Changes in accumulated other comprehensive income (loss) by component for the three and nine months ended September 30, 2016 (Predecessor), were as follows (in millions):
 
 
Cash Flow
Hedges
 
Three Months Ended September 30, 2016 (Predecessor)
 
 
 
Beginning balance, net of tax
 
$
7.4

 
Other comprehensive income (loss) before reclassifications:
 
 
Change in fair value of derivatives
 
2.3

 
Income tax effect
 
(0.8
)
 
Net of tax
 
1.5

 
Amounts reclassified from accumulated other comprehensive income:
 
 
Operating revenue: oil/natural gas production
7.7

 
Income tax effect
 
(2.7
)
 
Net of tax
 
5.0

 
Other comprehensive loss, net of tax
 
(3.5
)
 
Ending balance, net of tax
 
$
3.9

 

 
 
 
 
 
 
 
Cash Flow
Hedges
 
Foreign
Currency
Items
 
Total
Nine Months Ended September 30, 2016 (Predecessor)
 
 
 
 
 
Beginning balance, net of tax
$
24.0

 
$
(6.0
)
 
$
18.0

Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
Change in fair value of derivatives
(1.7
)
 
—

 
(1.7
)
Income tax effect
0.6

 
—

 
0.6

Net of tax
(1.1
)
 
—

 
(1.1
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
Operating revenue: oil/natural gas production
29.4

 
—

 
29.4

Other operational expenses
—

 
(6.0
)
 
(6.0
)
Income tax effect
(10.4
)
 
—

 
(10.4
)
Net of tax
19.0

 
(6.0
)
 
13.0

Other comprehensive income (loss), net of tax
(20.1
)
 
6.0

 
(14.1
)
Ending balance, net of tax
$
3.9

 
$
—

 
$
3.9