Investments in and Advances to Unconsolidated Affiliates (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Feb. 20, 2020 $ / shares shares	Feb. 29, 2020 USD ($) option $ / shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Mar. 15, 2021	Dec. 31, 2020 USD ($) $ / shares
Schedule of Equity Method Investments [Line Items]
Common stock, par value (in dollars per share) | $ / shares			$ 0.01			$ 0.01
Investment purchase price, cash			$ 0.0	$ 135.0
Investment purchase price, equity				23.1
Common stock offerings ( in shares) | shares			151,200
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01
Return on investment from unconsolidated affiliates			$ 5.5	8.7
Sam Houston Race Park and Valley Race Park | PM Texas Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Business acquisition, percentage of voting interests acquired					50.00%
Series D Preferred Stock
Schedule of Equity Method Investments [Line Items]
Common stock offerings ( in shares) | shares	883		43
Preferred stock, par value (in dollars per share) | $ / shares	$ 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
Barstool Sports, Inc
Schedule of Equity Method Investments [Line Items]
Ownership interest			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
Equity Method Investment, Ownership Percentage Acquired			0.30%
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			$ 1.4			$ 1.6
Prepaid advertising			16.3			16.5
Prepaid advertising, long-term			15.2			15.4
Investment balance			$ 154.6			147.5
Kansas Entertainment
Schedule of Equity Method Investments [Line Items]
Ownership interest			50.00%
Investment balance			$ 85.9			$ 85.2
Return on investment from unconsolidated affiliates			$ 5.5	8.7
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			$ 0.0	$ 4.6