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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
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:
| 2015 |  | 2014 |  | 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 |  |  | — |  |  | (3.7 | )
Adjustments and settlements | (0.5 | ) |  | (0.1 | ) |  | 0.3 |
Income tax provision | $ | 279.0 |  |  | $ | 262.5 |  |  | $ | 228.6 |
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:
| 2015 |  | % |  | 2014 |  | % |  | 2013 |  | %
Income tax provision at statutory rate | $ | 253.0 |  |  | 35.0 |  |  | $ | 238.8 |  |  | 35.0 |  |  | $ | 211.6 |  |  | 35.0 |
Non-deductible expenses (income), net | 3.5 |  |  | 0.5 |  |  | 1.3 |  |  | 0.2 |  |  | (0.6 | ) |  | (0.1 | )
State income taxes, net of federal benefit | 23.6 |  |  | 3.3 |  |  | 23.2 |  |  | 3.4 |  |  | 21.7 |  |  | 3.6 |
| 280.1 |  |  | 38.8 |  |  | 263.3 |  |  | 38.6 |  |  | 232.7 |  |  | 38.5 |
Change in valuation allowance, net | 0.1 |  |  | — |  |  | — |  |  | — |  |  | (3.7 | ) |  | (0.6 | )
Adjustments and settlements | (0.5 | ) |  | (0.1 | ) |  | (0.1 | ) |  | — |  |  | 0.3 |  |  | — |
Other, net | (0.7 | ) |  | (0.1 | ) |  | (0.7 | ) |  | (0.1 | ) |  | (0.7 | ) |  | (0.1 | )
Income tax provision | $ | 279.0 |  |  | 38.6 |  |  | $ | 262.5 |  |  | 38.5 |  |  | $ | 228.6 |  |  | 37.8 |
Deferred Income Tax Asset and Liability Components | Deferred income tax asset and liability components at December 31 are as follows:
| 2015 |  | 2014
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 (intangible 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 | )
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2015 |  | 2014 |  | 2013
Balance at January 1 | $ | 4.9 |  |  | $ | 4.8 |  |  | $ | 6.8 |
Additions based on tax positions related to the current year | — |  |  | — |  |  | — |
Additions for tax positions of prior years | 0.7 |  |  | 0.9 |  |  | 0.8 |
Reductions for tax positions of prior years | — |  |  | (0.1 | ) |  | (0.2 | )
Reductions for expirations of statute of limitations | — |  |  | (0.4 | ) |  | (2.2 | )
Settlements | — |  |  | (0.3 | ) |  | (0.4 | )
Balance at December 31 | $ | 5.6 |  |  | $ | 4.9 |  |  | $ | 4.8 |

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