Segment Information - Additional Information (Details) slot_machine in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2021 USD ($) game Segments sportsbook state slot_machine	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of operating segments \| Segments	3
Number of slot machines \| slot_machine	11
Number of table games \| game	200
Number of states in which Gaming segment has slot machines and video lottery terminals \| state	8
Total assets	$ 2,787.1	$ 2,686.4
All Other \| Segment Reconciling Items
Schedule of Equity Method Investments [Line Items]
Total assets	$ 99.8
Gaming
Schedule of Equity Method Investments [Line Items]
Number of sportsbooks \| sportsbook	6
Oak Grove \| Live and Historical Racing
Schedule of Equity Method Investments [Line Items]
Total assets		196.4
Turfway Park \| Live and Historical Racing
Schedule of Equity Method Investments [Line Items]
Total assets		52.1
Newport \| Live and Historical Racing
Schedule of Equity Method Investments [Line Items]
Total assets		$ 37.9
Rivers Des Plaines
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	61.30%	61.30%
Miami Valley Gaming LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%	50.00%

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