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Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 234.9 $ 235.0 $ 220.9
State 31.4 34.1 32.2
Federal and state deferred 3.7 10.3 9.5
Change in valuation allowance, net 0.3 0.1 0.0
Adjustments and settlements 0.3 (0.5) (0.1)
Income tax provision 270.6 279.0 262.5
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax provision at statutory rate 245.8 253.0 238.8
Non-deductible expenses (income), net 4.6 3.5 1.3
State income taxes, net of federal benefit 21.7 23.6 23.2
Income tax provision, excluding other reconciling items 272.1 280.1 263.3
Change in valuation allowance, net 0.3 0.1 0.0
Adjustments and settlements 0.3 (0.5) (0.1)
Other, net (2.1) (0.7) (0.7)
Income tax provision $ 270.6 $ 279.0 $ 262.5
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax provision at statutory rate, % 35.00% 35.00% 35.00%
Non-deductible expenses (income), net, % 0.70% 0.50% 0.20%
State income taxes, net of federal benefit, % 3.10% 3.30% 3.40%
Income tax provision, excluding other reconciling items, % 38.80% 38.80% 38.60%
Change in valuation allowance, net, % 0.00% 0.00% 0.00%
Adjustments and settlements, % 0.00% (0.10%) 0.00%
Other, net, % (0.30%) (0.10%) (0.10%)
Income tax provision, % 38.50% 38.60% 38.50%
Deferred income tax assets:      
Inventory $ 36.8 $ 35.1  
Receivable allowances 3.3 2.9  
Warranty, chargeback and self - insurance liabilities 71.2 63.5  
Other accrued liabilities 33.1 32.6  
Deferred compensation 31.8 28.5  
Stock-based compensation 25.7 24.3  
Loss carryforwards—federal and state 5.4 13.3  
Other, net 17.1 6.8  
Total deferred income tax assets 224.4 207.0  
Valuation allowance (2.5) (2.4)  
Deferred income tax assets, net of valuation allowance 221.9 204.6  
Deferred income tax liabilities:      
Long-lived assets (intangibles assets and property) (293.3) (263.8)  
Other, net (20.1) (19.4)  
Total deferred income tax liabilities (313.4) (283.2)  
Net deferred income tax liabilities (91.5) (78.6)  
Deferred Tax Assets, Net, Classification [Abstract]      
Deferred Tax Liabilities, Net, Noncurrent 91.5 78.6  
Income Taxes Receivable, Current 11.6 11.7  
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]      
Gross domestic state net operating and capital loss carryforwards 80.8    
State tax credits 4.1    
Valuation allowance related to loss carryforwards 2.5 $ 2.4  
Gross domestic state net operating loss carryforwards and capital loss carryforwards $ 6.0