Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Aug. 01, 2021	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Revenues:
Revenues	$ 1,511.8	$ 1,129.7	$ 4,332.5	$ 2,551.3
Adjusted EBITDAR:
Adjusted EBITDAR	480.3	452.6	1,513.9	729.4
Rent expense associated with triple net operating leases	(116.0)	(109.0)	(342.9)	(310.3)
Stock-based compensation	(8.5)	(2.8)	(21.9)	(11.7)
Cash-settled stock-based awards variance	(5.2)	(39.5)	(14.3)	(46.7)
Gain (loss) on disposal of assets	(0.3)	6.0	(0.1)	33.9
Contingent purchase price	(0.6)	0.0	(1.9)	1.4
Pre-opening expenses	(1.6)	(4.8)	(2.8)	(11.5)
Depreciation and amortization	(83.7)	(87.7)	(246.9)	(275.3)
Impairment losses	0.0	0.0	0.0	(616.1)
Insurance recoveries, net of deductible charges	0.0	0.0	0.0	0.1
Non-operating items of equity method investments	(3.0)	(1.2)	(6.0)	(3.2)
Interest expense, net	(144.9)	(142.3)	(418.6)	(407.1)
Other	6.0	55.6	27.3	63.1
Income (loss) before income taxes	122.5	126.9	485.8	(854.0)
Income tax benefit (expense)	(36.4)	14.3	(110.1)	172.2
Net income (loss)	86.1	141.2	375.7	(681.8)
Capital expenditures:
Capital expenditures	73.2	23.9	137.8	97.6
Assets:
Investment in and advances to unconsolidated affiliates	252.0		252.0			$ 266.8
Total assets	$ 15,748.7		$ 15,748.7			14,667.3
Sam Houston Race Park and Valley Race Park
Adjusted EBITDAR:
Business acquisition, percentage of voting interests acquired	50.00%		50.00%		50.00%
Operating Segments | Northeast
Revenues:
Revenues	$ 672.4	545.1	$ 1,895.8	1,168.5
Adjusted EBITDAR:
Adjusted EBITDAR	221.1	204.8	645.9	325.7
Capital expenditures:
Capital expenditures	35.1	10.3	71.3	62.3
Assets:
Investment in and advances to unconsolidated affiliates	0.1		0.1			0.1
Total assets	2,193.6		2,193.6			1,958.4
Operating Segments | South
Revenues:
Revenues	318.2	255.6	982.3	600.4
Adjusted EBITDAR:
Adjusted EBITDAR	137.0	120.3	448.0	217.3
Capital expenditures:
Capital expenditures	16.4	3.1	24.5	10.9
Assets:
Investment in and advances to unconsolidated affiliates	0.0		0.0			0.0
Total assets	1,188.9		1,188.9			1,165.4
Operating Segments | West
Revenues:
Revenues	145.7	78.7	382.7	223.0
Adjusted EBITDAR:
Adjusted EBITDAR	54.5	33.6	151.1	55.2
Capital expenditures:
Capital expenditures	2.3	1.4	5.5	5.5
Assets:
Investment in and advances to unconsolidated affiliates	0.0		0.0			0.0
Total assets	386.3		386.3			401.5
Operating Segments | Midwest
Revenues:
Revenues	285.7	229.1	815.2	493.2
Adjusted EBITDAR:
Adjusted EBITDAR	125.8	108.5	374.0	173.4
Capital expenditures:
Capital expenditures	7.3	4.8	12.8	9.7
Assets:
Investment in and advances to unconsolidated affiliates	83.4		83.4			85.2
Total assets	1,221.8		1,221.8			1,161.1
Other
Revenues:
Revenues	96.5	23.7	282.1	71.6
Adjusted EBITDAR:
Adjusted EBITDAR	(58.1)	(14.6)	(105.1)	(42.2)
Capital expenditures:
Capital expenditures	12.1	4.3	23.7	9.2
Assets:
Investment in and advances to unconsolidated affiliates	168.5		168.5			181.5
Total assets	10,758.1		10,758.1			$ 9,980.9
Intersegment eliminations
Revenues:
Revenues	$ (6.7)	$ (2.5)	$ (25.6)	$ (5.4)