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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Tax Disclosure [Abstract] 
Reconciliation of the expected statutory federal income tax provision to the Company's actual income tax provision
The following is a reconciliation of the expected statutory federal income tax provision to the Company’s actual income tax provision:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2010
 
2011
 
2010
 
(Dollars in millions)
Expected income tax provision at federal statutory rate
$
112.2

 
$
134.9

 
$
343.3

 
$
296.3

Excess depletion
(13.9
)
 
(25.8
)
 
(39.0
)
 
(44.4
)
Foreign earnings provision differential
(34.9
)
 
(29.8
)
 
(84.5
)
 
(57.1
)
Foreign earnings repatriation
—

 
84.5

 
—

 
84.5

Remeasurement of foreign income tax accounts
(38.7
)
 
42.7

 
(16.9
)
 
28.8

State income taxes, net of U.S. federal tax benefit
4.8

 
2.1

 
10.5

 
7.0

General business tax credits
(4.4
)
 
(5.6
)
 
(12.4
)
 
(13.1
)
Changes in valuation allowance
2.5

 
(63.7
)
 
7.0

 
(45.6
)
Changes in tax reserves
6.0

 
2.2

 
10.8

 
(4.9
)
Other, net
3.5

 
6.2

 
5.9

 
5.7

Total provision
$
37.1

 
$
147.7

 
$
224.7

 
$
257.2