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Business Combination, Contingent Consideration Arrangements, Number Of Annual Payments Remaining

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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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%