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Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | $ 317.6 | $ 301.5
Additions |  | 20.4 | 16.1
Balance, end of period |  | 338.0 | 317.6
Racing |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 51.7 | 51.7
Additions |  | 0.0 | 0.0
Balance, end of period |  | 51.7 | 51.7
Online Wagering |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 148.2 | 132.1
Additions |  | 0.0 | 16.1
Balance, end of period |  | 148.2 | 148.2
Casino |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning of period |  | 117.7 | 117.7
Additions | $ 20.4 | 20.4 | 0.0
Balance, end of period |  | $ 138.1 | $ 117.7

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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- Details
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- Details
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