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Investments in and Advances to Unconsolidated Affiliates - Additional Information (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 29, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Investment in Unconsolidated Affiliates
Receivable from partnership		$ 37.0		$ 37.0		$ 4.0
Investments in and advance to affiliates, subsidiaries, associates, and joint ventures		170.0		170.0		136.0
William Hill
Investment in Unconsolidated Affiliates
Agreement period	25 years
Percentage of equity stake	20.00%
Equity stake value in ordinary shares (in shares)	13
Receivable from partnership		$ 1.0		1.0		4.0
Fair value of initial investment	$ 13.4
Recognizing revenue on straight-line basis over a period		25 years
Recognized revenue		$ 2.0		7.0	$ 4.0
William Hill \| Other Long Term Liabilities
Investment in Unconsolidated Affiliates
Deferred revenue		135.0		135.0		142.0
William Hill US
Investment in Unconsolidated Affiliates
Fair value of initial investment	$ 129.0
Investments in and advance to affiliates, subsidiaries, associates, and joint ventures		126.0		126.0		127.0
William Hill PLC
Investment in Unconsolidated Affiliates
Fair value of restricted investments		43.0		43.0		29.0
Cumulative unrealized gain				15.0		$ 2.0
Unrealized loss on investments		$ 26.0	$ 4.0	$ 13.0	$ 1.0