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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Goodwill, by segment, is comprised of the following:
(in millions) | Churchill Downs |  | Online Wagering |  | Gaming |  | All Other |  | Total
Balances as of December 31, 2017 | $ | 49.7 |  |  | $ | 148.2 |  |  | $ | 118.7 |  |  | $ | 1.0 |  |  | $ | 317.6 |
Additions | — |  |  | — |  |  | 20.4 |  |  | — |  |  | 20.4 |
Balances as of December 31, 2018 | 49.7 |  |  | 148.2 |  |  | 139.1 |  |  | 1.0 |  |  | 338.0 |
Additions | — |  |  | — |  |  | 26.1 |  |  | 3.0 |  |  | 29.1 |
Balances as of December 31, 2019 | $ | 49.7 |  |  | $ | 148.2 |  |  | $ | 165.2 |  |  | $ | 4.0 |  |  | $ | 367.1 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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