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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | The significant components of the Provision for income tax expense related to continuing operations are as follows (in millions):
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |
Federal | $ | 103.8 |  |  | $ | 72.2 |  |  | $ | 16.1 |
State and other | 24.2 |  |  | 12.8 |  |  | 14.9 |
Total current expense | 128.0 |  |  | 85.0 |  |  | 31.0 |
Deferred: |  |  |  |  |  |  |  |
Federal | (13.7 | ) |  | 58.4 |  |  | 130.5 |
State and other | 4.6 |  |  | 2.4 |  |  | 2.4 |
Total deferred expense | (9.1 | ) |  | 60.8 |  |  | 132.9 |
Total income tax expense related to continuing operations | $ | 118.9 |  |  | $ | 145.8 |  |  | $ | 163.9 |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of differences between the federal income tax at statutory rates and our actual income tax expense on our income from continuing operations, which include federal, state, and other income taxes, is presented below:
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Tax expense at statutory rate | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Increase (decrease) in tax rate resulting from: |  |  |  |  |  |  |  |
State and other income taxes, net of federal tax benefit | 4.5 | % |  | 3.5 | % |  | 3.8 | %
(Decrease) increase in valuation allowance | (0.4 | )% |  | 0.4 | % |  | 0.1 | %
Nondeductible government, class action, and related settlements | 2.7 | % |  | — | % |  | — | %
Noncontrolling interests | (3.2 | )% |  | (4.6 | )% |  | (4.4 | )%
Share-based windfall tax benefits | (0.4 | )% |  | (1.8 | )% |  | — | %
Tax Act | — | % |  | (2.8 | )% |  | — | %
Other, net | (0.1 | )% |  | (0.3 | )% |  | (0.5 | )%
Income tax expense | 24.1 | % |  | 29.4 | % |  | 34.0 | %
Schedule of Components of Deferred Tax Assets and Liabilities | The significant components of our deferred tax assets and liabilities are presented in the following table (in millions):
| As of December 31,
| 2018 |  | 2017
Deferred income tax assets: |  |  |
Net operating loss | $ | 66.0 |  |  | $ | 77.3 |
Property, net | 30.8 |  |  | 36.3 |
Insurance reserve | 16.8 |  |  | 19.9 |
Stock-based compensation | 33.0 |  |  | 19.5 |
Revenue reserves | 6.1 |  |  | 14.0 |
Other accruals | 22.5 |  |  | 20.4 |
Tax credits | 4.7 |  |  | 2.8 |
Other | 0.6 |  |  | 0.5 |
Total deferred income tax assets | 180.5 |  |  | 190.7 |
Less: Valuation allowance | (33.7 | ) |  | (35.8 | )
Net deferred income tax assets | 146.8 |  |  | 154.9 |
Deferred income tax liabilities: |  |  |  |  |
Deferred revenue | — |  |  | (28.9 | )
Intangibles | (88.5 | ) |  | (80.0 | )
Carrying value of partnerships | (15.2 | ) |  | (11.4 | )
Other | (0.2 | ) |  | (0.2 | )
Total deferred income tax liabilities | (103.9 | ) |  | (120.5 | )
Net deferred income tax assets | $ | 42.9 |  |  | $ | 34.4 |
Schedule of Unrecognized Tax Benefits Rollforward | A reconciliation of the beginning and ending liability for unrecognized tax benefits is as follows (in millions):
| Gross Unrecognized Income Tax Benefits |  | Accrued Interest and Penalties
January 1, 2016 | $ | 2.9 |  |  | $ | — |
Gross amount of increases in unrecognized tax benefits related to prior periods | 0.3 |  |  | — |
Gross amount of decreases in unrecognized tax benefits related to prior periods | (0.4 | ) |  | — |
Gross amount of increases in unrecognized tax benefits related to current period | 0.1 |  |  | — |
Gross amount of decreases in unrecognized tax benefits related to current period | (0.1 | ) |  | — |
December 31, 2016 | 2.8 |  |  | — |
Gross amount of decreases in unrecognized tax benefits related to prior periods | (0.4 | ) |  | — |
Decreases in unrecognized tax benefits relating to settlements with taxing authorities | (2.1 | ) |  | — |
December 31, 2017 | 0.3 |  |  | — |
Gross amount of increases in unrecognized tax benefits related to prior periods | 0.8 |  |  | 0.1 |
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations | (0.2 | ) |  | — |
December 31, 2018 | $ | 0.9 |  |  | $ | 0.1 |

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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 of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + 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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