Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	$ 39.8	$ 46.8
Accumulated Amortization	(20.6)	(31.1)
Net Carrying Amount	19.2	15.7
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	169.4	174.0
Trademarks
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	21.2	25.7
Slots gaming rights
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	128.9	128.9
Illinois Horseracing Equity Trust
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	0.0	3.3
Other
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	0.1	0.4
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	16.7	27.1
Accumulated Amortization	(10.6)	(22.4)
Net Carrying Amount	6.1	4.7
Favorable contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	11.0	11.0
Accumulated Amortization	(6.8)	(6.2)
Net Carrying Amount	4.2	4.8
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	7.1	3.7
Accumulated Amortization	(1.5)	(1.0)
Net Carrying Amount	5.6	2.7
Table games license
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	2.7	2.7
Accumulated Amortization	(0.6)	(0.4)
Net Carrying Amount	2.1	2.3
Slots gaming license
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	2.3	2.3
Accumulated Amortization	(1.1)	(1.1)
Net Carrying Amount	$ 1.2	$ 1.2