Segment Information (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) segment	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				4
Revenues:
Total	$ 1,354.5		$ 789.7	$ 3,960.2	$ 2,432.6
Adjusted EBITDAR:
Adjusted EBITDAR	407.9		229.7	1,205.8	719.3
Rent expense associated with triple net operating lease	(96.3)		0.0	(271.0)	0.0
Stock-based compensation	(3.7)		(2.9)	(10.4)	(8.8)
Cash-settled stock-based awards variance	3.4		1.7	6.4	1.3
Loss on disposal of assets	(7.4)		(3.2)	(8.3)	(3.2)
Contingent purchase price	(1.2)		(0.4)	(7.0)	(1.7)
Pre-opening and acquisition costs	(7.4)		(5.2)	(15.5)	(17.2)
Depreciation and amortization	(106.3)		(56.9)	(316.4)	(175.8)
Recoveries on loan loss and unfunded loan commitments, net of impairment losses	0.0		0.0	0.0	16.4
Insurance recoveries, net of deductible charges	1.5		0.0	1.5	0.1
Non-operating items for Kansas JV	(0.9)		(1.3)	(2.8)	(3.9)
Interest expense, net	(133.5)		(114.6)	(400.5)	(345.7)
Loss on early extinguishment of debt	0.0		(0.3)	0.0	(3.8)
Other	7.2		(1.4)	7.2	(1.5)
Income before income taxes	63.3		45.2	189.0	175.5
Income tax expense	(19.6)		(9.1)	(53.0)	(40.0)
Net income	43.7		36.1	136.0	135.5
Capital expenditures:
Capital expenditures	41.7		24.0	136.7	57.0
Assets:
Investment in and advances to unconsolidated affiliates	128.5	$ 128.5		128.5
Total assets	14,318.0	$ 10,961.0		14,318.0		$ 13,424.8
South/West segment
Segment Reporting Information [Line Items]
Number of new reportable segments from division of segment | segment		2
Operating segments | Northeast segment
Revenues:
Total	628.9		441.4	1,778.6	1,365.4
Adjusted EBITDAR:
Adjusted EBITDAR	189.1		141.3	540.1	434.6
Capital expenditures:
Capital expenditures	22.8		11.0	67.3	23.7
Assets:
Investment in and advances to unconsolidated affiliates	0.1	$ 0.1		0.1
Total assets	2,298.9	1,330.2		2,298.9
Operating segments | South segment
Revenues:
Total	276.6		60.4	850.7	186.4
Adjusted EBITDAR:
Adjusted EBITDAR	89.0		17.1	279.6	58.8
Capital expenditures:
Capital expenditures	5.0		2.3	21.5	5.8
Assets:
Investment in and advances to unconsolidated affiliates	0.0	0.0		0.0
Total assets	1,423.8	1,082.3		1,423.8
Operating segments | West segment
Revenues:
Total	161.5		92.6	484.4	291.2
Adjusted EBITDAR:
Adjusted EBITDAR	50.6		21.8	151.0	71.8
Capital expenditures:
Capital expenditures	3.7		2.4	17.8	7.6
Assets:
Investment in and advances to unconsolidated affiliates	0.0	0.0		0.0
Total assets	750.5	755.7		750.5
Operating segments | Midwest segment
Revenues:
Total	275.8		185.4	815.3	559.0
Adjusted EBITDAR:
Adjusted EBITDAR	104.3		65.4	301.3	201.1
Capital expenditures:
Capital expenditures	6.2		7.4	22.6	15.6
Assets:
Investment in and advances to unconsolidated affiliates	90.6	89.4		90.6
Total assets	1,475.9	1,411.5		1,475.9
Other
Revenues:
Total	12.4		9.9	31.9	30.6
Adjusted EBITDAR:
Adjusted EBITDAR	(25.0)		(15.9)	(66.1)	(47.0)
Capital expenditures:
Capital expenditures	4.0		0.9	7.5	4.3
Assets:
Investment in and advances to unconsolidated affiliates	37.8	39.0		37.8
Total assets	8,368.9	$ 6,381.3		8,368.9
Intersegment eliminations
Revenues:
Total	(0.7)		0.0	(0.7)	0.0
Adjusted EBITDAR:
Adjusted EBITDAR	$ (0.1)		$ 0.0	$ (0.1)	$ 0.0