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Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 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
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax provision at statutory rate 222.8 245.8 253.0
Non-deductible expenses, net 5.9 4.6 3.5
State income taxes, net of federal benefit 19.7 21.7 23.6
Income tax provision, excluding other reconciling items 248.4 272.1 280.1
Change in tax rate (44.2) 0.0 0.0
Change in valuation allowance, net 3.3 0.3 0.1
Adjustments and settlements 0.3 0.3 (0.5)
Federal and state tax credits (3.7) (1.9) (0.6)
Other, net (2.6) (0.2) (0.1)
Income tax provision $ 201.5 $ 270.6 $ 279.0
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax provision at statutory rate, % 35.00% 35.00% 35.00%
Non-deductible expenses, net, % 0.90% 0.70% 0.50%
State income taxes, net of federal benefit, % 3.10% 3.10% 3.30%
Income tax provision, excluding other reconciling items, % 39.00% 38.80% 38.80%
Change in tax rate, % (6.90%) 0.00% 0.00%
Change in valuation allowance, net, % 0.50% 0.00% 0.00%
Adjustments and settlements, % 0.10% 0.00% (0.10%)
Federal and state tax credits, % (0.60%) (0.30%) (0.10%)
Other, net, % (0.40%) 0.00% 0.00%
Income tax provision, % 31.70% 38.50% 38.60%
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 (intangibles 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)  
Deferred Tax Assets, Net, Classification [Abstract]      
Deferred Tax Liabilities, Net, Noncurrent 71.9 91.5  
Accrued Income Taxes, Current 81.1    
Income Taxes Receivable, Current   11.6  
Valuation Allowance [Line Items]      
Gross domestic state net operating and capital loss carryforwards 82.0    
State tax credits 3.6    
Valuation allowance (5.4) $ (2.5)  
Gross domestic state net operating loss carryforwards and capital loss carryforwards 7.0    
Deferred Tax Asset, Loss Carry Forwards [Member]      
Deferred income tax assets:      
Valuation allowance (3.6)    
Valuation Allowance [Line Items]      
Valuation allowance (3.6)    
Deferred Tax Asset, Share-based Compensation [Member]      
Deferred income tax assets:      
Valuation allowance (1.8)    
Valuation Allowance [Line Items]      
Valuation allowance $ (1.8)