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Discontinued Operations and Assets Held for Sale - Income (Loss) From Discontinued Operations (Details) $ / a in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 22, 2021 USD ($) a $ / a | Sep. 29, 2021 USD ($) a
Big Fish Games | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net revenue | $ 0.0 | $ 0.0 | $ 0.0 |  |
Operating expenses | 0.0 | 0.0 | 0.0 |  |
Selling, general and administrative expense | 0.0 | 0.1 | 3.5 |  |
Research and development | 0.0 | 0.0 | 0.0 |  |
Legal settlement | 0.0 | 124.0 | 0.0 |  |
Total operating expense | 0.0 | 124.1 | 3.5 |  |
Operating loss | 0.0 | (124.1) | (3.5) |  |
Loss from discontinued operations before provision for income taxes | 0.0 | (124.1) | (3.5) |  |
Income tax benefit | 0.0 | 28.7 | 1.1 |  |
Loss from discontinued operations, net of tax | 0.0 | $ (95.4) | $ (2.4) |  |
Arlington Park | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Area of land sold | a |  |  |  |  | 326
Aggregate consideration |  |  |  |  | $ 197.2
Arlington International Racecourse | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Asset held for sale | 81.5 |  |  |  |
Severance costs | 1.4 |  |  |  |
Multi-employer pension liability | 3.9 |  |  |  |
Calder Property | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Area of land sold | a |  |  |  | 115.7 |
Aggregate consideration |  |  |  | $ 291.0 |
Asset held for sale | $ 6.3 |  |  |  |
Sale agreement, per acre | $ / a |  |  |  | 2.5 |

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