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Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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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

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