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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliations of the Company's ARO liability
Reconciliations of the Company’s asset retirement obligations are as follows:
 
December 31,
 
2014
 
2013
 
(Dollars in millions)
Balance at beginning of year
$
712.8

 
$
687.5

Liabilities incurred or acquired
22.7

 
—

Liabilities settled or disposed
(19.7
)
 
(15.4
)
Accretion expense
39.3

 
39.3

Revisions to estimates
(2.6
)
 
1.4

Balance at end of year
$
752.5

 
$
712.8

Less: Current portion (included in "Accounts payable and accrued expenses")
30.2

 
21.0

Noncurrent obligation (included in "Asset Retirement Obligations")
722.3

 
691.8

Balance at end of year — active locations
$
676.2

 
$
660.8

Balance at end of year — closed or inactive locations
$
76.3

 
$
52.0