Significant Accounting Policies - Revenue Disaggregation and Customer-Related Liabilities (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) agreement	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) agreement	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenues	$ 1,354.5	$ 789.7	$ 3,960.2	$ 2,432.6
Loyalty credit obligation
Disaggregation of Revenue [Line Items]
Customer-related liabilities	37.0		$ 37.0		$ 39.9
Customer-related liabilities, term			6 months
Advance payments on goods and services yet to be provided and unpaid wagers
Disaggregation of Revenue [Line Items]
Customer-related liabilities	33.8		$ 33.8		34.3
Customer-related liabilities, long-term	0.7		0.7		$ 0.7
Gaming
Disaggregation of Revenue [Line Items]
Revenues	1,088.5	646.3	3,185.2	1,965.9
Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	129.4	69.5	381.3	197.8
Hotel
Disaggregation of Revenue [Line Items]
Revenues	85.3	35.0	236.9	103.8
Racing
Disaggregation of Revenue [Line Items]
Revenues	7.0	5.3	23.7	18.9
Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues		3.9		57.3
Other
Disaggregation of Revenue [Line Items]
Revenues	44.3	29.7	133.1	88.9
Online sports betting and iGaming market access
Disaggregation of Revenue [Line Items]
Customer-related liabilities	$ 33.7		$ 33.7
Number of operator agreements containing ordinary shares and warrants | agreement	3		3
Operating segments | Northeast segment
Disaggregation of Revenue [Line Items]
Revenues	$ 628.9	441.4	$ 1,778.6	1,365.4
Operating segments | Northeast segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues	555.2	391.1	1,571.9	1,182.1
Operating segments | Northeast segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	39.4	25.7	112.8	72.3
Operating segments | Northeast segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues	13.7	5.9	31.3	16.0
Operating segments | Northeast segment | Racing
Disaggregation of Revenue [Line Items]
Revenues	5.6	3.8	19.1	14.0
Operating segments | Northeast segment | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues		3.9		46.8
Operating segments | Northeast segment | Other
Disaggregation of Revenue [Line Items]
Revenues	15.0	11.0	43.5	34.2
Operating segments | South segment
Disaggregation of Revenue [Line Items]
Revenues	276.6	60.4	850.7	186.4
Operating segments | South segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues	201.2	46.1	628.1	146.3
Operating segments | South segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	39.0	9.7	118.7	26.8
Operating segments | South segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues	27.5	2.9	77.0	8.5
Operating segments | South segment | Racing
Disaggregation of Revenue [Line Items]
Revenues	0.0	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	8.9	1.7	26.9	4.8
Operating segments | West segment
Disaggregation of Revenue [Line Items]
Revenues	161.5	92.6	484.4	291.2
Operating segments | West segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues	93.3	47.5	282.6	144.6
Operating segments | West segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	29.5	20.8	86.9	61.6
Operating segments | West segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues	32.4	20.4	95.7	62.4
Operating segments | West segment | Racing
Disaggregation of Revenue [Line Items]
Revenues	0.1	0.1	0.2	0.2
Operating segments | West segment | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues		0.0		10.5
Operating segments | West segment | Other
Disaggregation of Revenue [Line Items]
Revenues	6.2	3.8	19.0	11.9
Operating segments | Midwest segment
Disaggregation of Revenue [Line Items]
Revenues	275.8	185.4	815.3	559.0
Operating segments | Midwest segment | Gaming
Disaggregation of Revenue [Line Items]
Revenues	236.1	161.6	699.8	492.9
Operating segments | Midwest segment | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	21.0	13.1	61.7	36.3
Operating segments | Midwest segment | Hotel
Disaggregation of Revenue [Line Items]
Revenues	11.7	5.8	32.9	16.9
Operating segments | Midwest segment | Racing
Disaggregation of Revenue [Line Items]
Revenues	0.0	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	7.0	4.9	20.9	12.9
Other
Disaggregation of Revenue [Line Items]
Revenues	12.4	9.9	31.9	30.6
Other | Gaming
Disaggregation of Revenue [Line Items]
Revenues	3.3	0.0	3.4	0.0
Other | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	0.5	0.2	1.2	0.8
Other | Hotel
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Other | Racing
Disaggregation of Revenue [Line Items]
Revenues	1.3	1.4	4.4	4.7
Other | Reimbursable management costs
Disaggregation of Revenue [Line Items]
Revenues		0.0		0.0
Other | Other
Disaggregation of Revenue [Line Items]
Revenues	7.3	$ 8.3	22.9	$ 25.1
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(0.7)		(0.7)
Intersegment Eliminations | Gaming
Disaggregation of Revenue [Line Items]
Revenues	(0.6)		(0.6)
Intersegment Eliminations | Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Intersegment Eliminations | Hotel
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Intersegment Eliminations | Racing
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Intersegment Eliminations | Other
Disaggregation of Revenue [Line Items]
Revenues	$ (0.1)		$ (0.1)