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Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Balance, beginning of period | $ 366.8 | $ 367.1
Adjustments | 0.0 | (0.3)
Balance, end of period | 366.8 | 366.8
All Other |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 1.0 | 1.0
Adjustments | 0.0 | 0.0
Balance, end of period | 1.0 | 1.0
Live and Historical Racing | Operating Segments |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 52.4 | 52.7
Adjustments | 0.0 | (0.3)
Balance, end of period | 52.4 | 52.4
TwinSpires | Operating Segments |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 152.2 | 152.2
Adjustments | 0.0 | 0.0
Balance, end of period | 152.2 | 152.2
Gaming | Operating Segments |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 161.2 | 161.2
Adjustments | 0.0 | 0.0
Balance, end of period | $ 161.2 | $ 161.2

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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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