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Goodwill And Indefinite-Lived Intangible Assets Impairment Test (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] |
(in millions) | Racing |  | TwinSpires |  | Casino |  | Total
Balances as of December 31, 2017 | $ | 51.7 |  |  | $ | 148.2 |  |  | $ | 117.7 |  |  | $ | 317.6 |
Additions | — |  |  | — |  |  | — |  |  | — |
Balances as of June 30, 2018 | $ | 51.7 |  |  | $ | 148.2 |  |  | $ | 117.7 |  |  | $ | 317.6 |
Schedule of Indefinite and Finite Lived Assets |
| June 30, 2018 |  | December 31, 2017
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Definite-lived intangible assets | $ | 40.0 |  |  | $ | (23.7 | ) |  | $ | 16.3 |  |  | $ | 39.8 |  |  | $ | (20.6 | ) |  | $ | 19.2 |
Indefinite-lived intangible assets |  |  |  |  | 150.2 |  |  |  |  |  |  | 150.2 |
Total |  |  |  |  |  |  | $ | 166.5 |  |  |  |  |  |  | $ | 169.4 |
We performed our annual indefinite-lived intangible assets impairment analysis as of April 1, 2018, which included an assessment of qualitative and quantitative factors to determine whether it is more likely than not that the fair values of the indefinite-lived intangible assets are less than the carrying amount. We concluded that the fair values of our indefinite-lived intangible assets exceeded carrying value and therefore step two of the assessment was not required.

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- Definition Schedule of Indefinite and Finite Lived Assets [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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