Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									4
Revenues:
Total	$ 1,341.2	$ 1,354.5	$ 1,323.1	$ 1,282.6	$ 1,155.3	$ 789.7	$ 826.9	$ 816.1	$ 5,301.4	$ 3,587.9	$ 3,148.0
Adjusted EBITDAR:
Adjusted EBITDAR									1,605.2	1,043.2	879.1
Rent expense associated with triple net operating lease									(366.4)	(3.8)	0.0
Stock-based compensation									(14.9)	(12.0)	(7.8)
Cash-settled stock-based awards variance									(0.8)	19.6	(23.4)
Loss on disposal of assets									(5.5)	(3.2)	(0.2)
Contingent purchase price									(7.0)	(0.5)	6.8
Pre-opening and acquisition costs									(22.3)	(95.0)	(9.7)
Depreciation and amortization									(414.2)	(269.0)	(267.1)
Impairment losses									(173.1)	(34.9)	(18.0)
Recoveries on (provision for) loan loss and unfunded loan commitments									0.0	17.0	(89.8)
Insurance recoveries, net of deductible charges									3.0	0.1	0.3
Non-operating items for Kansas JV									(3.7)	(5.1)	(5.8)
Interest expense, net									(534.2)	(538.4)	(463.2)
Loss on early extinguishment of debt					(17.2)				0.0	(21.0)	(24.0)
Other									20.0	(7.1)	(2.3)
Income (loss) before income taxes									86.1	89.9	(25.1)
Income tax benefit (expense)									(43.0)	3.6	498.5
Net income	(92.9)	$ 43.7	$ 51.3	$ 41.0	(42.0)	$ 36.1	$ 54.0	$ 45.4	43.1	93.5	473.4
Capital expenditures:
Capital expenditures									190.6	92.6	99.3
Assets:
Investment in and advances to unconsolidated affiliates	128.3				128.5				128.3	128.5	148.9
Total assets	14,194.5				10,961.0				14,194.5	10,961.0	5,234.8	$ 13,424.8
Operating segments | Northeast segment
Revenues:
Total									2,399.9	1,891.5	1,756.6
Adjusted EBITDAR:
Adjusted EBITDAR									720.8	583.8	549.3
Capital expenditures:
Capital expenditures									96.2	38.9	26.3
Assets:
Investment in and advances to unconsolidated affiliates	0.1				0.1				0.1	0.1	0.1
Total assets	2,273.7				1,330.2				2,273.7	1,330.2	921.0
Operating segments | South segment
Revenues:
Total									1,118.9	394.4	224.3
Adjusted EBITDAR:
Adjusted EBITDAR									369.8	118.9	62.6
Capital expenditures:
Capital expenditures									29.8	10.6	6.3
Assets:
Investment in and advances to unconsolidated affiliates	0.0				0.0				0.0	0.0	0.0
Total assets	1,397.0				1,082.3				1,397.0	1,082.3	169.3
Operating segments | West segment
Revenues:
Total									642.5	437.9	380.4
Adjusted EBITDAR:
Adjusted EBITDAR									198.8	114.3	72.7
Capital expenditures:
Capital expenditures									21.2	12.8	35.7
Assets:
Investment in and advances to unconsolidated affiliates	0.0				0.0				0.0	0.0	0.0
Total assets	752.1				755.7				752.1	755.7	625.0
Operating segments | Midwest segment
Revenues:
Total									1,094.5	823.7	735.0
Adjusted EBITDAR:
Adjusted EBITDAR									403.6	294.3	249.7
Capital expenditures:
Capital expenditures									32.7	25.3	26.2
Assets:
Investment in and advances to unconsolidated affiliates	90.9				89.4				90.9	89.4	88.3
Total assets	1,412.2				1,411.5				1,412.2	1,411.5	970.8
Other
Revenues:
Total									47.5	40.4	51.7
Adjusted EBITDAR:
Adjusted EBITDAR									(87.8)	(68.1)	(55.2)
Capital expenditures:
Capital expenditures									10.7	5.0	4.8
Assets:
Investment in and advances to unconsolidated affiliates	37.3				39.0				37.3	39.0	60.5
Total assets	$ 8,359.5				$ 6,381.3				8,359.5	6,381.3	2,548.7
Intersegment eliminations
Revenues:
Total									$ (1.9)	$ 0.0	$ 0.0