| **Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) shares in Millions, $ in Millions** | 3 Months Ended |
|------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Net revenue:**                                                                                                 |           |   |
| Total net revenue                                                                                                | $ 252.9        | $ 265.4 |
| **Operating expense:**                                                                                           |           |   |
| Selling, general and administrative expense                                                                      | 24.1           | 24.9 |
| Impairment of intangible assets                                                                                  | 17.5           | 0.0 |
| Transaction expense, net                                                                                         | 0.3            | 3.5 |
| Total operating expense                                                                                          | 264.5          | 237.4 |
| Operating (loss) income                                                                                          | (11.6)         | 28.0 |
| **Other income (expense):**                                                                                      |           |   |
| Interest expense, net                                                                                            | (19.3)         | (13.7) |
| Equity in (loss) income of unconsolidated affiliates                                                             | (3.3)          | 4.1 |
| Total other expense                                                                                              | (22.6)         | (9.6) |
| (Loss) income from continuing operations before provision for income taxes                                       | (34.2)         | 18.4 |
| Income tax benefit (provision)                                                                                   | 11.6           | (6.5) |
| (Loss) income from continuing operations, net of tax                                                             | (22.6)         | 11.9 |
| Loss from discontinued operations, net of tax                                                                    | (0.9)          | (0.3) |
| Net (loss) income                                                                                                | (23.5)         | 11.6 |
| Net loss attributable to noncontrolling interest                                                                 | (0.1)          | 0.0 |
| Net (loss) income and comprehensive (loss) income attributable to CDI                                            | $ (23.4)       | $ 11.6 |
| **Net (loss) income per common share data, basic:**                                                              |           |   |
| Continuing operations (in dollars per share)                                                                     | $ (570,000)    | $ 0.30 |
| Discontinued operations (in dollars per share)                                                                   | (20,000.00)    | (0.01) |
| Net income per common share data - basic (in dollars per share)                                                  | (590,000)      | 0.29 |
| **Net (loss) income per common share data, diluted:**                                                            |           |   |
| Continuing operations (in dollars per share)                                                                     | (570,000)      | 0.30 |
| Discontinued operations (in dollars per share)                                                                   | (20,000.00)    | (0.01) |
| Net income per common share data - diluted (in dollars per share)                                                | $ (590,000)    | $ 0.29 |
| **Weighted average shares outstanding:**                                                                         |           |   |
| Basic (in shares)                                                                                                | 39.7           | 40.4 |
| Diluted (in shares)                                                                                              | 39.7           | 40.6 |
| Churchill Downs                                                                                                  |           |   |
| **Net revenue:**                                                                                                 |           |   |
| Churchill Downs                                                                                                  | $ 23.5         | $ 21.0 |
| **Operating expense:**                                                                                           |           |   |
| Operating expense                                                                                                | 26.6           | 23.4 |
| Online Wagering                                                                                                  |           |   |
| **Net revenue:**                                                                                                 |           |   |
| Online Wagering                                                                                                  | 67.3           | 63.1 |
| **Operating expense:**                                                                                           |           |   |
| Operating expense                                                                                                | 50.1           | 45.1 |
| Gaming                                                                                                           |           |   |
| **Net revenue:**                                                                                                 |           |   |
| Gaming                                                                                                           | 147.6          | 168.8 |
| **Operating expense:**                                                                                           |           |   |
| Operating expense                                                                                                | 124.8          | 125.0 |
| All Other                                                                                                        |           |   |
| **Net revenue:**                                                                                                 |           |   |
| All Other                                                                                                        | 14.5           | 12.5 |
| **Operating expense:**                                                                                           |           |   |
| Operating expense                                                                                                | $ 21.1         | $ 15.5 |

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.
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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.
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| - Definition
Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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| - Definition
Amount of income (loss) for proportionate share of equity method investee's income (loss).
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount of Net Income (Loss) attributable to noncontrolling interest.
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| - Definition
The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).
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| - Definition
Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.
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| - Definition
The net result for the period of deducting operating expenses from operating revenues.
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| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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| - Definition
The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257
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