Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Schedule Of Total Provision For Income Taxes

	For the Years Ended December 31,
	2011			2010		2009
Current income tax expense:
Federal	$	15.0		$	43.5	$	56.5
State and local		3.6			9.5		10.8
		18.6			53.0		67.3
Deferred income tax expense/(benefit):
Federal		(102.7	)		24.2		18.7
State and local		(19.3	)		1.7		2.9
		(122.0	)		25.9		21.6
Income tax expense/(benefit)	$	(103.4	)	$	78.9	$	88.9

Schedule Of Net Deferred Tax Liabilities

	As of December 31,
	2011			2010
Current portion of deferred tax assets (liabilities):
Allowance for doubtful accounts	$	6.8		$	8.1
Accrued expenses		2.0			1.7
Workers' compensation		6.1			6.3
Deferred revenue		(24.5	)		(29.2	)
Other		(2.1	)		(1.2	)
Current portion of deferred tax assets (liabilities)		(11.7)			(14.3)
Noncurrent portion of deferred tax assets (liabilities):
Amortization of intangible assets		92.9			(34.7	)
Property and equipment		(37.0	)		(30.0	)
Share-based compensation		7.6			7.4
Other		1.1			1.4
Capital loss carry forward		0.1			0.1
NOL carry forward, expiring beginning in 2011		4.7			6.5
Less: valuation allowance		(0.8	)		(3.0	)
Noncurrent portion of deferred tax assets (liabilities):		68.6			(52.3	)
Net deferred tax assets (liabilities)	$	56.9		$	(66.6	)

Schedule Of Sources Of The Tax Effects

	For the Years Ended December 31,
	2011			2010			2009
Income tax expense/(benefit) computed on federal statutory rate		(35.0	)%		35.0	%		35.0	%
State income taxes and other, net of federal benefit		(2.3	)		3.8			4.4
Valuation allowance		(0.5	)		(0.1	)		(0.6	)
Tax credits		—			—			(0.4	)
Goodwill impairment		16.0			—			—
Nondeductible expenses and other, net		0.2			0.3			0.4
Income tax expense/(benefit)		(21.6	)%		39.0	%		38.8	%

Schedule Of Reconciliation Of Unrecognized Tax Benefits

	For the Years  Ended December 31,
	2011			2010
Balance at beginning of period	$	0.7		$	1.1
Plus: additions based on tax positions related to the current year		—			—
Plus: additions for tax positions of prior years		—			—
Less: reductions made for tax positions of prior years		(0.7	)		(0.4	)
Settlements		—			—
Balance at end of period	$	—		$	0.7