Equity Investments - Schedules of Equity Method Investments (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2010	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity investments		$ 298.4	$ 253.9
Earnings from equity investments		24.9	26.7	$ 13.0
Distributed earnings from equity investments		62.5	67.3	51.7
Revenue from the sale of instant tickets to equity method investment		69.9	95.0	93.7
Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		298.4	163.5
Earnings from equity investments		24.9	26.7	13.0
Distributed earnings from equity investments		62.5	67.3	51.7
LNS
Schedule of Equity Method Investments [Line Items]
Revenue from the sale of instant tickets to equity method investment		40.0	44.9	45.3
LNS | Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		224.1	75.1
Earnings from equity investments		16.4	14.3	14.0
Distributed earnings from equity investments		37.3	40.4	34.3
Northstar IL
Schedule of Equity Method Investments [Line Items]
Revenue from the sale of instant tickets to equity method investment		0.0	22.8	22.6
Northstar IL | Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		0.0	0.0
Earnings from equity investments		(0.6)	2.8	(0.4)
Distributed earnings from equity investments		0.0	0.0	0.0
Northstar NJ and NJ Supply Co
Schedule of Equity Method Investments [Line Items]
Revenue from the sale of instant tickets to equity method investment		23.3	20.6	20.9
Northstar NJ and NJ Supply Co | Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		25.5	21.2
Earnings from equity investments		3.3	0.9	1.0
Distributed earnings from equity investments		0.0	4.6	4.8
GLB and CSG | Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		23.1	35.3
Earnings from equity investments		0.6	(0.1)	(8.0)
Distributed earnings from equity investments		10.8	5.0	1.7
International Terminal Leasing | Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		3.8	8.1
Earnings from equity investments		0.1	0.8	0.0
Distributed earnings from equity investments		4.3	5.6	5.9
Other
Schedule of Equity Method Investments [Line Items]
Revenue from the sale of instant tickets to equity method investment		6.6	6.7	4.9
Other | Equity Method Investments, Excluding Fair Value Accounting Method
Schedule of Equity Method Investments [Line Items]
Equity investments		21.9	23.8
Earnings from equity investments		5.1	8.0	6.4
Distributed earnings from equity investments		10.1	11.7	5.0
NYX
Schedule of Equity Method Investments [Line Items]
Equity investments		0.0	90.4
Earnings from equity investments		0.0	0.0	0.0
Distributed earnings from equity investments		$ 0.0	$ 0.0	$ 0.0
Lottery | LNS
Schedule of Equity Method Investments [Line Items]
Agreement term	9 years
Equity interest (as a percent)		20.00%
Lottery | Northstar IL
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)		20.00%
Lottery | Northstar NJ
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)		17.69%
Lottery | Northstar SupplyCo New Jersey, LLC
Schedule of Equity Method Investments [Line Items]
Equity interest (as a percent)		30.00%