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ASSET RETIREMENT OBLIGATIONS (Tables)
 6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Changes in Asset Retirement Obligations
The change in our asset retirement obligations during the period from January 1, 2017 through February 28, 2017 (Predecessor) and the period from March 1, 2017 through June 30, 2017 (Successor) is set forth below (in millions, inclusive of current portion):
 
 
Asset retirement obligations as of January 1, 2017 (Predecessor)
$
242.0

Liabilities settled
(3.6
)
Divestment of properties
(8.7
)
Accretion expense
5.4

Asset retirement obligations as of February 28, 2017 (Predecessor)
235.2

Fair value fresh start adjustment
54.9

Asset retirement obligations as of February 28, 2017 (Successor)
290.1

Liabilities settled
(32.8
)
Accretion expense
11.6

Revision of estimates
11.0

Asset retirement obligations as of June 30, 2017 (Successor)
$
279.8