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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 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
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Income tax provision at statutory rate   211.6 180.9 161.4
Non-deductible expenses (income), net   (0.6) (0.2) 1.1
State income taxes, net of federal benefit   21.7 18.8 16.7
Income tax provision, excluding other reconciling items   232.7 199.5 179.2
Change in valuation allowance, net   (3.7) 0.1 (0.2)
Adjustments and settlements   0.3 0.3 (0.6)
Other, net   (0.7) (0.4) (1.3)
Income tax provision   228.6 199.5 177.1
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Income tax provision at statutory rate, %   35.00% 35.00% 35.00%
Non-deductible expenses (income), net, %   (0.10%) 0.00% 0.20%
State income taxes, net of federal benefit, %   3.60% 3.60% 3.60%
Income tax provision, excluding other reconciling items, %   38.50% 38.60% 38.80%
Change in valuation allowance, net, %   (0.60%) 0.00% 0.00%
Adjustments and settlements, %   0.00% 0.00% (0.20%)
Other, net, %   (0.10%) 0.00% (0.20%)
Income tax provision, %   37.80% 38.60% 38.40%
Deferred income tax assets:        
Inventory 24.6 24.6 20.3  
Receivable reserves 3.0 3.0 4.0  
Warranty, chargeback and self - insurance liabilities 49.2 49.2 42.8  
Other accrued liabilities 21.6 21.6 18.7  
Deferred compensation 19.7 19.7 12.9  
Stock-based compensation 24.1 24.1 20.6  
Loss carryforwards—federal and state 10.5 10.5 13.8  
Other, net 12.7 12.7 15.4  
Total deferred income tax assets 165.4 165.4 148.5  
Valuation allowance (2.7) (2.7) (6.5)  
Deferred income tax assets, net of valuation allowance 162.7 162.7 142.0  
Deferred income tax liabilities:        
Long-lived assets (intangibles assets and property) (200.2) (200.2) (170.1)  
Other, net (21.3) (21.3) (16.6)  
Total deferred income tax liabilities (221.5) (221.5) (186.7)  
Net deferred income tax assets (liabilities) (58.8) (58.8) (44.7)  
Deferred Tax Assets, Net, Classification [Abstract]        
Deferred tax assets, net, current 57.7 57.7 44.7  
Deferred tax liabilities, net, noncurrent 116.5 116.5 89.4  
Income taxes payable included in other current liabilities 8.4 8.4 3.2  
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Gross domestic state net operating and capital loss carryforwards 173.5 173.5    
State tax credits 4.5 4.5    
Deferred tax asset, loss carryforwards and tax credits 10.5 10.5    
Valuation allowance related to loss carryforwards 2.7 2.7 6.5  
Valuation allowance, deferred tax asset, change in amount 3.4 3.4    
Recognized net tax benefits related to adjustments and resolution of certain income tax matters       $ 1.3