Investments in and Advances to Unconsolidated Affiliates - Additional information (Details) $ / shares in Units, $ in Millions				1 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
	Oct. 01, 2021 USD ($)	Aug. 01, 2021 USD ($)	Feb. 20, 2020 $ / shares shares	Feb. 29, 2020 USD ($) option $ / shares	Sep. 30, 2021 $ / shares shares	Mar. 31, 2021 shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment purchase price, cash									$ 0.0	$ 135.0	$ 0.0
Barstool Sports investment (Note 7)										23.1
Stock issuance/offerings ( in shares) | shares					43,000	151,200
Preferred stock, par value (in dollars per share) | $ / shares									$ 0.01
Return on investment from unconsolidated affiliates									$ 31.8	$ 21.8	29.0
Sam Houston Race Park and Valley Race Park
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Investments		$ 29.9
Series D Preferred Stock
Schedule of Equity Method Investments [Line Items]
Stock issuance/offerings ( in shares) | shares			883		43	43
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01					$ 0.01	$ 0.01	$ 0.01
Preferred stock, conversion period			4 years
Preferred stock, percent to convert in each tranche			20.00%
Convertible preferred stock, shares issued upon conversion (in shares) | shares									26
Convertible preferred stock, conversion ratio			0.001
Barstool Sports, Inc
Schedule of Equity Method Investments [Line Items]
Common stock, par value (in dollars per share) | $ / shares				$ 0.0001
Investment balance								$ 147.5	$ 162.5	$ 147.5
Barstool Sports, Inc
Schedule of Equity Method Investments [Line Items]
Ownership interest								36.00%	36.00%	36.00%
Investment acquired, percent				36.00%
Investment acquired, percent, delayed basis				1.00%
Common stock, par value (in dollars per share) | $ / shares					$ 0.0001
Investment purchase price	$ 325.0			$ 161.2
Investment purchase price, cash				135.0
Barstool Sports investment (Note 7)				$ 23.1
Investment acquired, period after which ownership will increase				3 years
Investment acquired, ownership percentage following additional investment	50.00%			50.00%
Investment acquired, expected additional investment	$ 62.0			$ 62.0
Investment acquired, valuation of acquiree total common stock outstanding at time of acquisition	$ 450.0			$ 450.0
Investment acquired, period after which remaining shares of investment are callable				3 years
Investment acquired, fair market value at time of exercise, cap				$ 650.0
Investment acquired, multiplier of revenue to calculate floor at time of exercise	2.25			2.25
Stock issuance/offerings ( in shares) | shares									86
Ownership acquired						0.30%			0.60%
Equity method investment acquired, percentage of shares acquired on delayed basis				1.00%
Commercial agreement term				10 years
Commercial agreement number of renewals | option				3
Commercial agreement renewal term				10 years
Commercial agreement term with exercise of renewals				40 years
Customer list intangible asset								$ 1.6	$ 0.8	$ 1.6
Prepaid advertising								16.5	15.4	16.5
Prepaid advertising, long-term								15.4	$ 14.2	15.4
Kansas Entertainment
Schedule of Equity Method Investments [Line Items]
Ownership interest									50.00%
Investment balance								85.2	$ 83.8	85.2
Return on investment from unconsolidated affiliates									$ 31.8	$ 20.0	$ 29.0
Freehold Raceway
Schedule of Equity Method Investments [Line Items]
Ownership interest									50.00%
MAXXAM
Schedule of Equity Method Investments [Line Items]
Ownership interest									50.00%
Other-than-temporary impairment of investment							$ 4.6	$ 0.0	$ 0.0