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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Provision | The income tax provision was as follows (in millions):
Year Ended December 31, |  | 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |  |
Federal |  | $ | 30.3 |  |  | $ | 95.1 |  |  | $ | 68.1 |
State |  | 11.5 |  |  | 16.9 |  |  | 13.8 |
|  | 41.8 |  |  | 112.0 |  |  | 81.9 |
Deferred: |  |  |  |  |  |
Federal |  | 20.4 |  |  | (14.2 | ) |  | 4.9 |
State |  | 9.6 |  |  | 4.1 |  |  | (0.4 | )
|  | 30.0 |  |  | (10.1 | ) |  | 4.5 |
Total |  | $ | 71.8 |  |  | $ | 101.9 |  |  | $ | 86.4 |
Schedule of Effective Income Tax Rate Reconciliation | The reconciliation between amounts computed using the federal income tax rate of 21% in 2018 and 35% in all other years and our income tax provision is shown in the following tabulation (in millions):
Year Ended December 31, |  | 2018 |  | 2017 |  | 2016
Federal tax provision at statutory rate |  | $ | 70.9 |  |  | $ | 121.5 |  |  | $ | 99.2 |
State taxes, net of federal income tax benefit |  | 16.1 |  |  | 13.3 |  |  | 10.8 |
Equity investment basis difference |  | — |  |  | — |  |  | 9.5 |
Non-deductible items |  | 1.5 |  |  | 1.3 |  |  | 1.4 |
Permanent differences related to stock-based compensation |  | (0.1 | ) |  | (0.8 | ) |  | 0.1 |
Net change in valuation allowance |  | 0.5 |  |  | 0.3 |  |  | (5.1 | )
General business credits |  | (1.1 | ) |  | (0.9 | ) |  | (28.0 | )
Deferred revaluation for change in statutory tax rate |  | (15.8 | ) |  | (32.9 | ) |  | — |
Other |  | (0.2 | ) |  | 0.1 |  |  | (1.5 | )
Income tax provision |  | $ | 71.8 |  |  | $ | 101.9 |  |  | $ | 86.4 |
Schedule of Deferred Tax Assets and Liabilities | Individually significant components of the deferred tax assets and (liabilities) are presented below (in millions):
December 31, |  | 2018 |  | 2017
Deferred tax assets: |  |  |  |
Deferred revenue and cancellation reserves |  | $ | 47.2 |  |  | $ | 39.4 |
Allowances and accruals, including state NOL carryforward amounts |  | 40.8 |  |  | 36.3 |
Credits and other |  | 0.3 |  |  | 1.1 |
Valuation allowance |  | (1.1 | ) |  | (0.6 | )
Total deferred tax assets |  | 87.2 |  |  | 76.2 |
Deferred tax liabilities: |  |  |  |
Inventories |  | (42.0 | ) |  | (20.9 | )
Goodwill |  | (48.2 | ) |  | (35.0 | )
Property and equipment, principally due to differences in depreciation |  | (78.0 | ) |  | (73.4 | )
Prepaid expenses and other |  | (10.2 | ) |  | (3.2 | )
Total deferred tax liabilities |  | (178.4 | ) |  | (132.5 | )
Total |  | $ | (91.2 | ) |  | $ | (56.3 | )
Summary of Open Tax Years | Open tax years at December 31, 2018 included the following:
Federal | 2015 - 2018
20 states | 2014 - 2018

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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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