Income Taxes (Tables)

6 Months Ended

Jun. 30, 2011

Income Taxes [Abstract]

Reconciliation of the expected statutory federal income tax provision to the Company's actual income tax provision

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
	(Dollars in millions)
Expected income tax provision at federal statutory rate	$	144.5		$	93.8		$	231.1		$	161.4
Excess depletion		(14.3	)		(12.9	)		(25.1	)		(22.6	)
Foreign earnings provision differential		(33.7	)		(13.1	)		(49.7	)		(27.9	)
Remeasurement of foreign income tax accounts		15.4			(19.3	)		21.8			(13.9	)
State income taxes, net of U.S. federal tax benefit		3.9			2.1			5.6			4.5
General business tax credits		(4.8	)		(3.9	)		(8.0	)		(7.5	)
Changes in valuation allowance		3.5			17.5			4.5			22.7
Changes in tax reserves		2.9			(8.9	)		4.9			(7.1	)
Other, net		2.4			(1.9	)		2.5			(0.1	)
Total provision	$	119.8		$	53.4		$	187.6		$	109.5