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Valuation and Qualifying Accounts Schedule II (Tables)
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]  
Summary of Valuation Allowance [Table Text Block]
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

Description
 
Balance at
Beginning of Period
 
Charged to
Costs and Expenses
 
Deductions(1)
 
Other
 
Balance
at End of Period
 
 
(Dollars in millions)
Year Ended December 31, 2013
 
 

 
 

 
 

 
 

 
 

Reserves deducted from asset accounts:
 
 

 
 

 
 

 
 

 
 

Advance royalty recoupment reserve
 
$
15.3

 
$
0.1

 
$
(5.7
)
(2) 
$
—

 
$
9.7

Reserve for materials and supplies
 
16.0

 
1.7

 
(10.3
)
 
—

 
7.4

Allowance for doubtful accounts
 
13.7

 
4.3

 
(10.1
)
 
(0.5
)
(3) 
7.4

Tax valuation allowances
 
1,481.8

 
(29.4
)
 
—

 
181.7

(4) 
1,634.1

Year Ended December 31, 2012
 
 

 
 

 
 

 
 

 
 

Reserves deducted from asset accounts:
 
 

 
 

 
 

 
 

 
 

Advance royalty recoupment reserve
 
$
21.3

 
$
2.9

 
$
(9.0
)
(2) 
$
0.1

(5) 
$
15.3

Reserve for materials and supplies
 
6.5

 
13.7

 
(4.2
)
 
—

 
16.0

Allowance for doubtful accounts
 
17.0

 
(0.5
)
 
(0.7
)
 
(2.1
)
(3) 
13.7

Tax valuation allowances
 
79.8

 
521.5

 
(77.0
)
(6) 
957.5

(7) 
1,481.8

Year Ended December 31, 2011
 
 

 
 

 
 

 
 

 
 

Reserves deducted from asset accounts:
 
 

 
 

 
 

 
 

 
 

Advance royalty recoupment reserve
 
$
19.9

 
$
1.8

 
$
(0.1
)
 
$
(0.3
)
(5) 
$
21.3

Reserve for materials and supplies
 
6.2

 
3.7

 
(3.4
)
 
—

 
6.5

Allowance for doubtful accounts
 
30.3

 
(3.7
)
 
(0.4
)
 
(9.2
)
(3) 
17.0

Tax valuation allowances
 
65.0

 
15.4

 
—

 
(0.6
)
 
79.8

(1) 
Reserves utilized, unless otherwise indicated.
(2) 
Deductions to advance royalty recoupment reserve represents the termination of federal and state leases.
(3) 
Represents subsequent recovery of receivable amounts previously reserved.
(4) 
Related to the Australian minerals and resource rent tax, as offset by the impact of the 2013 decrease in Australian dollar exchange rates.
(5) 
Balances transferred (to) from other accounts or reserves recorded as part of a property transaction or acquisition.
(6) 
Deductions include write-off of loss carryforwards and reversal of related valuation allowances.
(7) 
Includes changes to valuation allowances primarily related to deferred tax assets acquired in business combinations and initial deferred tax assets resulting from the minerals resource rent tax implemented in Australia in 2012