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Valuation and Qualifying Accounts Schedule II (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015
 
 

 
 

 
 

 
 

 
 

Reserves deducted from asset accounts:
 
 

 
 

 
 

 
 

 
 

Advance royalty recoupment reserve
 
$
7.6

 
$
—

 
$
(0.9
)
(2) 
$
1.6

(3) 
$
8.3

Reserve for materials and supplies
 
4.6

 
0.4

 
(0.3
)
 
—

 
4.7

Allowance for doubtful accounts
 
5.8

 
8.0

 
(7.2
)
 
—

 
6.6

Tax valuation allowances
 
1,169.0

 
462.0

 
—

 
(183.7
)
(4) 
1,447.3

Year Ended December 31, 2014
 
 

 
 

 
 

 
 

 
 

Reserves deducted from asset accounts:
 
 

 
 

 
 

 
 

 
 

Advance royalty recoupment reserve
 
$
9.7

 
$
(0.2
)
 
$
(1.9
)
(2) 
$
—

 
$
7.6

Reserve for materials and supplies
 
7.4

 
(0.1
)
 
(2.7
)
 
—

 
4.6

Allowance for doubtful accounts
 
7.4

 
1.5

 
(1.4
)
 
(1.7
)
(5) 
5.8

Tax valuation allowances
 
1,634.1

 
569.4

 
—


(1,034.5
)
(6) 
1,169.0

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
)
(5) 
7.4

Tax valuation allowances
 
1,481.8

 
(29.4
)
 
—

 
181.7

(7) 
1,634.1

(1) 
Reserves utilized, unless otherwise indicated.
(2) 
Deductions to advance royalty recoupment reserve represents the termination of federal and state leases.
(3) 
Balances transferred from other accounts.
(4) 
Includes a decrease in valuation allowance during the period reflected directly in "Accumulated other comprehensive loss" and the impact of the 2015 decrease in Australian dollar exchange rates.
(5) 
Represents subsequent recovery of receivable amounts previously reserved.
(6) 
Includes the write-off of valuation allowance against deferred tax assets related to the Australian Minerals and Resource Rent Tax (MRRT) due to the repeal of that legislation in 2014, along with an increase in valuation allowance during the period reflected directly in "Accumulated other comprehensive loss" and the impact of the 2014 decrease in Australian dollar exchange rates.
(7) Related to the MRRT, as offset by the impact of the 2013 decrease in Australian dollar exchange rates.