Revenue Disaggregation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues									$ 5,301.4	$ 3,587.9	$ 3,331.5
Less: Promotional allowance									0.0	0.0	(183.5)
Total revenues	$ 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
Gaming
Disaggregation of Revenue [Line Items]
Revenues									4,268.7	2,894.9	2,692.0
Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									512.0	314.8	292.4
Hotel
Disaggregation of Revenue [Line Items]
Revenues									311.0	163.6	129.9
Racing
Disaggregation of Revenue [Line Items]
Revenues									31.3	26.8	62.7
Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues										57.3	26.1
Other
Disaggregation of Revenue [Line Items]
Revenues									178.4	130.5	128.4
Operating segments | Northeast segment
Disaggregation of Revenue [Line Items]
Revenues									2,399.9	1,891.5	1,818.7
Less: Promotional allowance											(62.1)
Total revenues									2,399.9	1,891.5	1,756.6
Operating segments | Northeast segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues									2,117.1	1,644.2	1,583.9
Operating segments | Northeast segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									155.1	109.6	115.0
Operating segments | Northeast segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues									43.5	23.2	21.5
Operating segments | Northeast segment | Racing
Disaggregation of Revenue [Line Items]
Revenues									25.1	20.3	49.6
Operating segments | Northeast segment | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues										46.8	0.0
Operating segments | Northeast segment | Other
Disaggregation of Revenue [Line Items]
Revenues									59.1	47.4	48.7
Operating segments | South segment
Disaggregation of Revenue [Line Items]
Revenues									1,118.9	394.4	255.1
Less: Promotional allowance											(30.8)
Total revenues									1,118.9	394.4	224.3
Operating segments | South segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues									831.1	302.9	203.0
Operating segments | South segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									154.1	56.6	35.5
Operating segments | South segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues									98.2	23.3	10.3
Operating segments | South segment | Racing
Disaggregation of Revenue [Line Items]
Revenues									0.0	0.0	0.0
Operating segments | South segment | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues										0.0	0.0
Operating segments | South segment | Other
Disaggregation of Revenue [Line Items]
Revenues									35.5	11.6	6.3
Operating segments | West segment
Disaggregation of Revenue [Line Items]
Revenues									642.5	437.9	423.2
Less: Promotional allowance											(42.8)
Total revenues									642.5	437.9	380.4
Operating segments | West segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues									374.3	228.0	219.7
Operating segments | West segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									116.7	89.6	82.4
Operating segments | West segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues									125.9	90.8	76.1
Operating segments | West segment | Racing
Disaggregation of Revenue [Line Items]
Revenues									0.6	0.6	2.3
Operating segments | West segment | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues										10.5	26.1
Operating segments | West segment | Other
Disaggregation of Revenue [Line Items]
Revenues									25.0	18.4	16.6
Operating segments | Midwest segment
Disaggregation of Revenue [Line Items]
Revenues									1,094.5	823.7	782.2
Less: Promotional allowance											(47.2)
Total revenues									1,094.5	823.7	735.0
Operating segments | Midwest segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues									938.1	719.8	685.4
Operating segments | Midwest segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									84.7	57.9	58.4
Operating segments | Midwest segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues									43.4	26.3	22.0
Operating segments | Midwest segment | Racing
Disaggregation of Revenue [Line Items]
Revenues									0.0	0.0	0.0
Operating segments | Midwest segment | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues										0.0	0.0
Operating segments | Midwest segment | Other
Disaggregation of Revenue [Line Items]
Revenues									28.3	19.7	16.4
Other
Disaggregation of Revenue [Line Items]
Revenues									47.5	40.4	52.3
Less: Promotional allowance											(0.6)
Total revenues									47.5	40.4	51.7
Other | Gaming
Disaggregation of Revenue [Line Items]
Revenues									8.8	0.0	0.0
Other | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									1.4	1.1	1.1
Other | Hotel
Disaggregation of Revenue [Line Items]
Revenues									0.0	0.0	0.0
Other | Racing
Disaggregation of Revenue [Line Items]
Revenues									5.6	5.9	10.8
Other | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues										0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Revenues									31.7	33.4	40.4
Intersegment eliminations
Disaggregation of Revenue [Line Items]
Revenues									(1.9)
Total revenues									(1.9)	$ 0.0	$ 0.0
Intersegment eliminations | Gaming
Disaggregation of Revenue [Line Items]
Revenues									(0.7)
Intersegment eliminations | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues									0.0
Intersegment eliminations | Hotel
Disaggregation of Revenue [Line Items]
Revenues									0.0
Intersegment eliminations | Racing
Disaggregation of Revenue [Line Items]
Revenues									0.0
Intersegment eliminations | Other
Disaggregation of Revenue [Line Items]
Revenues									$ (1.2)