Investments in and Advances to Unconsolidated Affiliates (Details) $ / shares in Units, $ in Millions										1 Months Ended	3 Months Ended				6 Months Ended	9 Months Ended
	Oct. 01, 2021 USD ($)	Aug. 01, 2021 USD ($)	Sep. 25, 2020 shares	Sep. 25, 2020 shares	Sep. 24, 2020 shares	May 19, 2020 shares	May 19, 2020 shares	May 14, 2020 shares	Feb. 20, 2020 $ / shares shares	Feb. 29, 2020 USD ($) option $ / shares	Sep. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 $ / shares shares	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares
Schedule of Equity Method Investments [Line Items]
Common stock, par value (in dollars per share) | $ / shares											$ 0.01					$ 0.01		$ 0.01
Investment purchase price, cash																$ 0.0	$ 135.0
Investment purchase price, equity																	23.1
Common stock offerings ( in shares) | shares			2,100,000	16,100,000	14,000,000	2,500,000	19,166,667	16,666,667				151,200				43,000
Preferred stock, par value (in dollars per share) | $ / shares												$ 0.01
Return on investment from unconsolidated affiliates																$ 23.9	17.3
Other-than-temporary impairment of investment											$ 0.0
Sam Houston Race Park and Valley Race Park
Schedule of Equity Method Investments [Line Items]
Business acquisition, percentage of voting interests acquired		50.00%									50.00%					50.00%
Gain on transaction		$ 29.9
Series D Preferred Stock
Schedule of Equity Method Investments [Line Items]
Common stock 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 ratio									0.001
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					26
Common Stock
Schedule of Equity Method Investments [Line Items]
Preferred stock, conversion ratio									1
Barstool Sports, Inc
Schedule of Equity Method Investments [Line Items]
Ownership interest											36.00%					36.00%
Investment acquired, percent										36.00%
Investment acquired, percent, delayed basis										1.00%						1.00%
Common stock, par value (in dollars per share) | $ / shares										$ 0.0001		$ 0.0001
Investment purchase price										$ 161.2
Investment purchase price, cash										135.0
Investment purchase price, equity										$ 23.1
Investment acquired, period after which ownership will increase										3 years
Investment acquired, ownership percentage following additional investment										50.00%
Investment acquired, expected additional investment										$ 62.0
Investment acquired, valuation of acquiree total common stock outstanding at time of acquisition										$ 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
Common stock offerings ( in shares) | shares																86
Equity method investment, ownership percentage											0.30%	0.30%				0.60%
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											$ 1.0					$ 1.0		$ 1.6
Prepaid advertising											15.7					15.7		16.5
Prepaid advertising, long-term											14.6					14.6		15.4
Investment balance											$ 160.0					$ 160.0		147.5
Barstool Sports, Inc | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Investment purchase price	$ 325.0
Investment acquired, ownership percentage following additional investment	50.00%
Investment acquired, expected additional investment	$ 62.0
Investment acquired, valuation of acquiree total common stock outstanding at time of acquisition	$ 450.0
Investment acquired, multiplier of revenue to calculate floor at time of exercise	2.25
Kansas Entertainment
Schedule of Equity Method Investments [Line Items]
Ownership interest											50.00%					50.00%
Investment balance											$ 83.4					$ 83.4		$ 85.2
Return on investment from unconsolidated affiliates											$ 10.5		$ 6.8			$ 23.9	$ 15.5
Freehold Raceway
Schedule of Equity Method Investments [Line Items]
Ownership interest											50.00%					50.00%
MAXXAM
Schedule of Equity Method Investments [Line Items]
Other-than-temporary impairment of investment														$ 4.6	$ 0.0	$ 0.0