Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Components of the provision for income taxes

	Year Ended December 31,
	2011			2010			2009
	(in millions)
Current:
Federal	$	20.0		$	(22.2	)	$	5.8
State		5.5			(2.0	)		0.7
Foreign		5.4			5.0			7.9
Total current		30.9			(19.2	)		14.4
Deferred:
Federal		62.7			57.0			(27.1	)
State		1.2			3.4			(3.5	)
Foreign		(3.0	)		(0.3	)		6.8
Total deferred		60.9			60.1			(23.8	)
Provision	$	91.8		$	40.9		$	(9.4	)

Components of deferred tax liabilities and assets

	December 31,
	2011			2010
	(in millions)
Deferred tax liabilities:
Depreciation, depletion, and amortization	$	740.8		$	667.3
Derivatives		14.5			—
Convertible debt		88.4			80.9
Total deferred tax liabilities		843.7			748.2
Deferred tax assets:
Workers compensation, pensions, and other benefits		47.8			44.7
Warranties and reserves		14.4			17.5
Equity items		72.8			56.4
Tax loss carryforwards and credits		234.9			224.3
Inventory		11.1			7.6
Accrued liabilities and other		4.7			1.6
Total deferred tax assets		385.7			352.1
Net deferred tax liabilities before valuation allowance		458.0			396.1
Valuation allowance		19.3			19.9
Net deferred tax liabilities before reserve for uncertain tax positions		477.3			416.0
Deferred tax assets included in reserve for uncertain tax positions		(42.6	)		(25.0	)
Adjusted net deferred tax liabilities	$	434.7		$	391.0

Reconciliation between the statutory United States federal income tax rate and the Company's effective income tax rate

	Year Ended December 31,
	2011			2010			2009
Statutory rate		35.0	%		35.0	%		35.0	%
State taxes		2.1			3.3			1.9
Impairment of goodwill		—			—			(23.7	)
Changes in valuation allowances		—			—			(6.5	)
Tax settlements		—			4.4			—
Changes in tax reserves		—			(9.6	)		—
Other, net		1.6			2.0			(0.3	)
Effective rate		38.7	%		35.1	%		6.4	%

Change in unrecognized tax benefits

	Year Ended December 31,
	2011			2010			2009
	(in millions)
Beginning balance	$	36.8		$	40.1		$	32.9
Additions for tax positions related to the current year		3.8			3.3			5.8
Additions for tax positions of prior years		16.4			9.3			7.5
Reductions for tax positions of prior years		(0.1	)		(5.6	)		(4.5	)
Settlements		(3.5	)		(9.5	)		(1.5	)
Expirations of statute of limitations		(0.9	)		(0.8	)		(0.1	)
Ending balance	$	52.5		$	36.8		$	40.1