Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Schedule Of Provision For Income Taxes

	Year Ended December 31,
	2011			2010			2009
Current:
Federal	$	26.4		$	3.3		$	1.1
Foreign		0.1			—			—
State and local		1.3			3.3			1.0
	$	27.8		$	6.6		$	2.1
Deferred:
Federal	$	36.3		$	54.7		$	5.5
Foreign		(1.7	)		—			—
State and local, net of valuation provisions		5.7			2.3			0.8
	$	40.3		$	57.0		$	6.3
Provision for income taxes	$	68.1		$	63.6		$	8.4
Effective income tax rate		39.1	%		41.3	%		10.6	%

Schedule Of Deferred Tax Assets And Liabilities

	2011			2010
Deferred tax assets:
Accrued self insurance	$	16.3		$	14.1
Compensation and benefits		12.3			9.6
Operating loss carryforward		11.5			12.8
Tax credit carryforward		—			1.4
Property and equipment		7.2			1.0
Bad debts		2.5			2.8
Other		9.0			7.6
Valuation allowance		(2.8	)		(5.6	)
Total deferred tax assets	$	56.0		$	43.7
Deferred tax liabilities:
Property and equipment	$	61.5		$	35.6
Goodwill		34.6			24.7
Other intangible assets		34.3			20.7
Gain on remeasurement of equity investee		11.1			—
Accounts receivable retainage		11.6			6.7
Other		14.9			6.5
Total deferred tax liabilities	$	168.0		$	94.2
Net deferred tax liabilities	$	(112.0	)	$	(50.5	)

Schedule of Net Deferred Tax Assets And Liabilities

	2011			2010
Net current deferred tax assets	$	10.6		$	12.0
Net noncurrent deferred tax liabilities		(122.6	)		(62.5	)
Net deferred tax liabilities	$	(112.0	)	$	(50.5	)

Reconciliation Of Effective Income Tax Rate

	2011			2010			2009
U.S. statutory federal rate applied to pretax income		35.0	%		35.0	%		35.0	%
State and local income taxes, net of federal benefit		3.4			3.2			4.1
Foreign tax rate differential		0.2			0.1			0.1
Non-deductible expenses		1.7			2.9			1.5
Change in state tax rate		0.2			(0.8	)		0.5
Domestic production activities deduction		(0.9	)		(0.1	)		—
Other		(0.0	)		0.9			0.1
Change in valuation allowance for deferred tax assets		(0.5	)		0.1			(30.7	)
Effective income tax rate		39.1	%		41.3	%		10.6	%