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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliations of the Company's ARO liability
Reconciliations of the Company’s asset retirement obligations are as follows:
 
Successor
Predecessor
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
January 1 through April 1, 2017
 
(Dollars in millions)
Balance at beginning of period
$
691.1

 
$
664.2

$
758.8

Liabilities incurred or acquired
16.3

 
—

—

Liabilities settled or disposed
(57.8
)
 
(65.2
)
(2.7
)
Accretion expense
48.5

 
32.6

12.5

Revisions to estimates
52.1

 
59.5

(104.4
)
Balance at end of period
$
750.2

 
$
691.1

$
664.2

Less: Current portion (included in “Accounts payable and accrued expenses”)
63.8

 
34.1

31.1

Noncurrent obligation (included in “Asset retirement obligations”)
$
686.4

 
$
657.0

$
633.1

Balance at end of period — active locations
$
671.8

 
$
612.9

$
540.1

Balance at end of period — closed or inactive locations
$
78.4

 
$
78.2

$
124.1