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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current: |  |  |
Federal | $ 235.0 | $ 220.9 | $ 189.7
State | 34.1 | 32.2 | 28.9
Federal and state deferred | 10.3 | 9.5 | 13.4
Change in valuation allowance, net | 0.1 | 0.0 | (3.7)
Adjustments and settlements | (0.5) | (0.1) | 0.3
Income tax provision | 279.0 | 262.5 | 228.6
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income tax provision at statutory rate | 253.0 | 238.8 | 211.6
Non-deductible expenses (income), net | 3.5 | 1.3 | (0.6)
State income taxes, net of federal benefit | 23.6 | 23.2 | 21.7
Income tax provision, excluding other reconciling items | 280.1 | 263.3 | 232.7
Change in valuation allowance, net | 0.1 | 0.0 | (3.7)
Adjustments and settlements | (0.5) | (0.1) | 0.3
Other, net | (0.7) | (0.7) | (0.7)
Income tax provision | $ 279.0 | $ 262.5 | $ 228.6
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Income tax provision at statutory rate, % | 35.00% | 35.00% | 35.00%
Non-deductible expenses (income), net, % | 0.50% | 0.20% | (0.10%)
State income taxes, net of federal benefit, % | 3.30% | 3.40% | 3.60%
Income tax provision, excluding other reconciling items, % | 38.80% | 38.60% | 38.50%
Change in valuation allowance, net, % | 0.00% | 0.00% | (0.60%)
Adjustments and settlements, % | (0.10%) | 0.00% | 0.00%
Other, net, % | (0.10%) | (0.10%) | (0.10%)
Income tax provision, % | 38.60% | 38.50% | 37.80%
Deferred income tax assets: |  |  |
Inventory | $ 35.1 | $ 28.9 |
Receivable reserves | 2.9 | 3.0 |
Warranty, chargeback and self - insurance liabilities | 63.5 | 57.8 |
Other accrued liabilities | 32.6 | 25.1 |
Deferred compensation | 28.5 | 24.0 |
Stock-based compensation | 24.3 | 26.8 |
Loss carryforwards—federal and state | 13.3 | 7.2 |
Other, net | 6.8 | 13.2 |
Total deferred income tax assets | 207.0 | 186.0 |
Valuation allowance | (2.4) | (2.5) |
Deferred income tax assets, net of valuation allowance | 204.6 | 183.5 |
Deferred income tax liabilities: |  |  |
Long-lived assets (intangibles assets and property) | (263.8) | (233.6) |
Other, net | (19.4) | (19.2) |
Total deferred income tax liabilities | (283.2) | (252.8) |
Net deferred income tax liabilities | (78.6) | (69.3) |
Deferred Tax Assets, Net, Classification [Abstract] |  |  |
Deferred tax assets, net, current |  | 68.6 |
Deferred Tax Liabilities, Net, Noncurrent | 78.6 | 137.9 |
Income Taxes Receivable, Current | 11.7 |  |
Income taxes payable included in other current liabilities |  | 17.5 |
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] |  |  |
Gross domestic state net operating and capital loss carryforwards | 110.3 |  |
State tax credits | 4.2 |  |
Valuation allowance related to loss carryforwards | 2.4 | $ 2.5 |
Gross domestic state net operating loss carryforwards and capital loss carryforwards | $ 7.3 |  |

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