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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following is a reconciliation of the expected statutory federal income tax provision to the Company’s actual income tax provision:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
 
(Dollars in millions)
Expected income tax provision at federal statutory rate
$
60.2

 
$
115.6

 
$
212.1

 
$
360.6

Excess depletion
(16.7
)
 
(17.0
)
 
(58.8
)
 
(53.0
)
Foreign earnings provision differential
(17.5
)
 
(23.8
)
 
(72.0
)
 
(74.3
)
Remeasurement of foreign income tax accounts
13.6

 
(38.7
)
 
8.7

 
(16.9
)
State income taxes, net of U.S. federal tax benefit
4.4

 
2.9

 
15.5

 
9.2

General business tax credits
(13.5
)
 
(4.4
)
 
(47.6
)
 
(12.7
)
Changes in valuation allowance
4.1

 
2.5

 
(30.9
)
 
7.0

Changes in tax reserves
8.6

 
6.0

 
21.9

 
10.8

Other, net
6.1

 
(3.9
)
 
36.6

 
8.1

Total provision
$
49.3

 
$
39.2

 
$
85.5

 
$
238.8