Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of components of income tax provision (benefit) from continuing operations

The components of the income tax provision from continuing operations for the years ended December 31 are as follows:

	2013			2012		2011
Current:
Federal	$	189.7		$	146.9	$	125.3
State	28.9			25.1		21.3
Federal and state deferred	13.4			27.1		31.3
Change in valuation allowance, net	(3.7		)	0.1		(0.2		)
Adjustments and settlements	0.3			0.3		(0.6		)
Income tax provision	$	228.6		$	199.5	$	177.1

Schedule of reconciliation of income tax provision (benefit)

A reconciliation of the income tax provision calculated using the statutory federal income tax rate to our income tax provision from continuing operations for the years ended December 31 is as follows:

	2013			%		2012			%	2011			%
Income tax provision at statutory rate	$	211.6		35.0		$	180.9		35.0	$	161.4		35.0
Non-deductible expenses (income), net	(0.6		)	(0.1	)	(0.2		)	—	1.1			0.2
State income taxes, net of federal benefit	21.7			3.6		18.8			3.6	16.7			3.6
	232.7			38.5		199.5			38.6	179.2			38.8
Change in valuation allowance, net	(3.7		)	(0.6	)	0.1			—	(0.2		)	—
Adjustments and settlements	0.3			—		0.3			—	(0.6		)	(0.2	)
Other, net	(0.7		)	(0.1	)	(0.4		)	—	(1.3		)	(0.2	)
Income tax provision	$	228.6		37.8		$	199.5		38.6	$	177.1		38.4

Schedule of net deferred income tax asset and liability

Deferred income tax asset and liability components at December 31 are as follows:

	2013			2012
Deferred income tax assets:
Inventory	$	24.6		$	20.3
Receivable reserves	3.0			4.0
Warranty, chargeback, and self-insurance liabilities	49.2			42.8
Other accrued liabilities	21.6			18.7
Deferred compensation	19.7			12.9
Stock-based compensation	24.1			20.6
Loss carryforwards—federal and state	10.5			13.8
Other, net	12.7			15.4
Total deferred income tax assets	165.4			148.5
Valuation allowance	(2.7		)	(6.5		)
Deferred income tax assets, net of valuation allowance	162.7			142.0
Deferred income tax liabilities:
Long-lived assets (intangible assets and property)	(200.2		)	(170.1		)
Other, net	(21.3		)	(16.6		)
Total deferred income tax liabilities	(221.5		)	(186.7		)
Net deferred income tax assets (liabilities)	$	(58.8	)	$	(44.7	)

Schedule of reconciliation of unrecognized tax benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2013			2012			2011
Balance at January 1	$	6.8		$	6.4		$	6.9
Additions based on tax positions related to the current year	—			—			—
Additions for tax positions of prior years	0.8			0.5			0.9
Reductions for tax positions of prior years	(0.2		)	—			—
Reductions for expirations of statute of limitations	(2.2		)	—			—
Settlements	(0.4		)	(0.1		)	(1.4		)
Balance at December 31	$	4.8		$	6.8		$	6.4