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Restructuring (Tables)
 3 Months Ended
Mar. 31, 2016
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
The following table presents accrued restructuring and related activity for Coal Mining and Corporate and Other as of and for the three months ended March 31, 2016, which is included in accrued liabilities on the Consolidated Balance Sheet:
 
Coal Mining
 
Corporate
 
Total
 
 
 
 
 
 
 
(Dollars in millions)
Balance at December 31, 2015
$
0.8

 
$
3.9

 
$
4.7

Charges
0.2

 
—

 
0.2

Cash payments
(0.4
)
 
(1.5
)
 
(1.9
)
Balance at March 31, 2016
$
0.6

 
$
2.4

 
$
3.0