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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 2017 |  | 2016 |  | 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 |
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:
| 2017 |  | % |  | 2016 |  | % |  | 2015 |  | %
Income tax provision at statutory rate | $ | 222.8 |  |  | 35.0 |  |  | $ | 245.8 |  |  | 35.0 |  |  | $ | 253.0 |  |  | 35.0 |
Non-deductible expenses, net | 5.9 |  |  | 0.9 |  |  | 4.6 |  |  | 0.7 |  |  | 3.5 |  |  | 0.5 |
State income taxes, net of federal benefit | 19.7 |  |  | 3.1 |  |  | 21.7 |  |  | 3.1 |  |  | 23.6 |  |  | 3.3 |
| 248.4 |  |  | 39.0 |  |  | 272.1 |  |  | 38.8 |  |  | 280.1 |  |  | 38.8 |
Change in tax rate | (44.2 | ) |  | (6.9 | ) |  | — |  |  | — |  |  | — |  |  | — |
Change in valuation allowance, net | 3.3 |  |  | 0.5 |  |  | 0.3 |  |  | — |  |  | 0.1 |  |  | — |
Adjustments and settlements | 0.3 |  |  | 0.1 |  |  | 0.3 |  |  | — |  |  | (0.5 | ) |  | (0.1 | )
Federal and state tax credits | (3.7 | ) |  | (0.6 | ) |  | (1.9 | ) |  | (0.3 | ) |  | (0.6 | ) |  | (0.1 | )
Other, net | (2.6 | ) |  | (0.4 | ) |  | (0.2 | ) |  | — |  |  | (0.1 | ) |  | — |
Income tax provision | $ | 201.5 |  |  | 31.7 |  |  | $ | 270.6 |  |  | 38.5 |  |  | $ | 279.0 |  |  | 38.6 |
Deferred Income Tax Asset and Liability Components | Deferred income tax asset and liability components at December 31 are as follows:
| 2017 |  | 2016
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 (intangible 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 | )
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2017 |  | 2016 |  | 2015
Balance at January 1 | $ | 5.8 |  |  | $ | 5.6 |  |  | $ | 4.9 |
Additions based on tax positions related to the current year | — |  |  | — |  |  | — |
Additions for tax positions of prior years | 0.8 |  |  | 0.8 |  |  | 0.7 |
Reductions for tax positions of prior years | — |  |  | (0.4 | ) |  | — |
Reductions for expirations of statute of limitations | (0.2 | ) |  | (0.2 | ) |  | — |
Settlements | — |  |  | — |  |  | — |
Balance at December 31 | $ | 6.4 |  |  | $ | 5.8 |  |  | $ | 5.6 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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