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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation [Abstract]  
Reconciliation of changes in the asset retirement obligation
The following table provides a reconciliation of changes in the asset retirement obligation from operations during each period:
 
(Dollars in millions)
Balance at January 1, 2014
$
17.9

Liabilities incurred
2.6

Liabilities settled
(0.6
)
Accretion expense(1)
1.4

Revisions in estimated cash flows
0.9

Balance at December 31, 2014
$
22.2

Liabilities settled
(2.1
)
Accretion expense(1)
1.4

Revisions in estimated cash flows
0.7

Balance at December 31, 2015
$
22.2

 
(1)
Included in cost of products sold and operating expenses on the Consolidated Statements of Operations.