Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	$ 187.4	$ 224.8
Accumulated Amortization	(100.0)	(86.9)
Net Carrying Amount	87.4	137.9
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	445.7	496.2
Trademarks
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	225.7	225.7
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)	3.3	3.3
Other
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)	0.4	0.4
Developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	87.0	87.0
Accumulated Amortization	(45.6)	(23.3)
Net Carrying Amount	41.4	63.7
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	43.0	75.1
Accumulated Amortization	(33.3)	(46.6)
Net Carrying Amount	9.7	28.5
Strategic development
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	25.0	30.5
Accumulated Amortization	(7.3)	(6.6)
Net Carrying Amount	17.7	23.9
In-process research & development
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	12.7	12.7
Accumulated Amortization	(5.1)	(2.6)
Net Carrying Amount	7.6	10.1
Favorable contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	11.0	11.0
Accumulated Amortization	(6.2)	(5.5)
Net Carrying Amount	4.8	5.5
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	3.7	3.7
Accumulated Amortization	(1.0)	(0.9)
Net Carrying Amount	2.7	2.8
Table games license
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	2.7	2.5
Accumulated Amortization	(0.4)	(0.3)
Net Carrying Amount	2.3	2.2
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