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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Components of Income Tax Provision From Continuing Operations
The components of the income tax provision from continuing operations for the years ended December 31 are as follows:
 
2017
 
2016
 
2015
Current:
 
 
 
 
 
Federal
$
190.6

 
$
234.9

 
$
235.0

State
29.4

 
31.4

 
34.1

Federal and state deferred
(22.1
)
 
3.7

 
10.3

Change in valuation allowance, net
3.3

 
0.3

 
0.1

Adjustments and settlements
0.3

 
0.3

 
(0.5
)
Income tax provision
$
201.5

 
$
270.6

 
$
279.0

Reconciliation of Income Tax Provision
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:
 
2017
 
%
 
2016
 
%
 
2015
 
%
Income tax provision at statutory rate
$
222.8

 
35.0

 
$
245.8

 
35.0

 
$
253.0

 
35.0

Non-deductible expenses, net
5.9

 
0.9

 
4.6

 
0.7

 
3.5

 
0.5

State income taxes, net of federal benefit
19.7

 
3.1

 
21.7

 
3.1

 
23.6

 
3.3

 
248.4

 
39.0

 
272.1

 
38.8

 
280.1

 
38.8

Change in tax rate
(44.2
)
 
(6.9
)
 

 

 

 

Change in valuation allowance, net
3.3

 
0.5

 
0.3

 

 
0.1

 

Adjustments and settlements
0.3

 
0.1

 
0.3

 

 
(0.5
)
 
(0.1
)
Federal and state tax credits
(3.7
)
 
(0.6
)
 
(1.9
)
 
(0.3
)
 
(0.6
)
 
(0.1
)
Other, net
(2.6
)
 
(0.4
)
 
(0.2
)
 

 
(0.1
)
 

Income tax provision
$
201.5

 
31.7

 
$
270.6

 
38.5

 
$
279.0

 
38.6

Deferred Income Tax Asset and Liability Components
Deferred income tax asset and liability components at December 31 are as follows:
 
2017
 
2016
Deferred income tax assets:
 
 
 
Inventory
$
22.8

 
$
36.8

Receivable allowances
1.9

 
3.3

Warranty, chargeback, and self-insurance liabilities
47.4

 
71.2

Other accrued liabilities
25.4

 
33.1

Deferred compensation
18.8

 
31.8

Stock-based compensation
18.9

 
25.7

Loss carryforwards—federal and state
6.5

 
5.4

Other, net
10.2

 
17.1

Total deferred income tax assets
151.9

 
224.4

Valuation allowance
(5.4
)
 
(2.5
)
Deferred income tax assets, net of valuation allowance
146.5

 
221.9

Deferred income tax liabilities:
 
 
 
Long-lived assets (intangible assets and property)
(207.1
)
 
(293.3
)
Other, net
(11.3
)
 
(20.1
)
Total deferred income tax liabilities
(218.4
)
 
(313.4
)
Net deferred income tax liabilities
$
(71.9
)
 
$
(91.5
)
Schedule of Unrecognized Tax Benefits Roll Forward
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
 
2017
 
2016
 
2015
Balance at January 1
$
5.8

 
$
5.6

 
$
4.9

Additions based on tax positions related to the current year

 

 

Additions for tax positions of prior years
0.8

 
0.8

 
0.7

Reductions for tax positions of prior years

 
(0.4
)
 

Reductions for expirations of statute of limitations
(0.2
)
 
(0.2
)
 

Settlements

 

 

Balance at December 31
$
6.4

 
$
5.8

 
$
5.6