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Fair Value Measurements - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) payment | Dec. 31, 2019 USD ($) payment | May 19, 2020 | Jan. 19, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity securities |  | $ 143.1 | $ 40.5 |  |
Holding gain on equity securities |  | 106.7 | $ 19.9 |  |
Impairment of promissory notes and bonds |  | $ 2.5 |  |  |
Plainridge Park Casino |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Period of actual earnings used to calculate contingent consideration |  | 10 years |  |  |
Number of remaining annual payments | payment |  | 5 | 6 |  |
Repayments of debt | $ 8.2 |  |  |  |
5.625% Notes due 2027 | Senior notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate |  | 5.625% | 5.625% |  | 5.625%
2.75% Convertible Notes due 2026 | Convertible Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate |  | 2.75% |  | 2.75% |
Pinnacle Retama Partners, LLC | Local government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Bonds, at amortized cost |  | $ 6.7 | $ 6.7 |  |
Retama Development Corporation | Pinnacle Retama Partners, LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Promissory notes |  | $ 15.1 | $ 15.1 |  |
Retama Nominal Holder, LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Ownership interest |  | 1.00% |  |  |
Pinnacle Retama Partners, LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Ownership interest by parent |  | 75.50% |  |  |

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