Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Provision (benefit) for income taxes for continuing

	Year Ended December 31,
(in millions)	2011			2010			2009
Income from continuing operations before income taxes:
United States	$	2,026.7		$	1,918.2		$	1,312.4
Foreign		(2.3	)		(9.5	)		(4.0	)
Total	$	2,024.4		$	1,908.7		$	1,308.4
Current provision:
Federal	$	565.2		$	545.8		$	407.7
State		42.5			40.3			25.6
Foreign		3.1			0.1			(1.8	)
Total current provision		610.8			586.2			431.5
Deferred provision:
Federal		125.3			113.1			43.0
State		12.4			4.5			3.9
Foreign		0.1			0.3			3.4
Total deferred provision		137.8			117.9			50.3
Total current and deferred provision	$	748.6		$	704.1		$	481.8

Reconciliation of the statutory federal income tax rate and the effective tax rate

	Year Ended December 31,
	2011			2010			2009
Statutory federal income tax rate		35.0	%		35.0	%		35.0	%
State taxes, net of federal benefit		2.0			1.7			1.7
Other, net		—			0.2			0.1
Effective tax rate		37.0	%		36.9	%		36.8	%

Deferred tax assets and deferred tax liabilities of continuing operation

	December 31,
(in millions)	2011			2010
Deferred tax assets:
Allowance for doubtful accounts	$	11.6		$	17.7
Net operating loss carryforwards and other tax attributes		33.0			34.8
Deferred compensation		7.0			5.6
Equity compensation		42.9			38.5
Accrued expenses		51.6			73.6
Other		3.9			3.4
Gross deferred tax assets		150.0			173.6
Less valuation allowance		(25.1	)		(23.2	)
Net deferred tax assets		124.9			150.4
Deferred tax liabilities:
Depreciation and property differences		(100.8	)		(71.1	)
Goodwill and customer contract amortization		(516.6	)		(438.0	)
Prepaids		(0.8	)		(1.4	)
Other		(7.4	)		(2.8	)
Gross deferred tax liabilities		(625.6	)		(513.3	)
Net deferred tax liabilities	$	(500.7	)	$	(362.9	)

Reconciliation of the beginning and ending amount of unrecognized tax benefits

(in millions)	2011			2010			2009
Balance at January 1	$	56.4		$	56.1		$	40.4
Additions for tax positions related to prior years		7.1			7.4			11.1
Reductions for tax positions related to prior years		(29.3	)		(5.0	)		(2.2	)
Additions for tax positions related to the current year		4.9			—			12.9
Reductions for tax positions related to the current year		—			(1.8	)		—
Reductions attributable to settlements with taxing authorities		(5.1	)		—			(0.2	)
Reductions as a result of a lapse of the applicable statute of limitations		(1.7	)		(0.3	)		(5.9	)
Balance at December 31	$	32.3		$	56.4		$	56.1