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Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |
Balance, beginning of period | $ 841.7 | $ 840.9
Additions |  | 0.8
Adjustments | (9.5) |
Balance, end of period | 832.2 | 841.7
Racing |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 51.7 | 51.7
Additions |  | 0.0
Adjustments | 0.0 |
Balance, end of period | 51.7 | 51.7
Casinos |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 117.6 | 117.6
Additions |  | 0.0
Adjustments | 0.0 |
Balance, end of period | 117.6 | 117.6
TwinSpires |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 132.1 | 131.3
Additions |  | 0.8
Adjustments | 0.0 |
Balance, end of period | 132.1 | 132.1
Big Fish Games |  |
Goodwill [Roll Forward] |  |
Balance, beginning of period | 540.3 | 540.3
Additions |  | 0.0
Adjustments | (9.5) |
Balance, end of period | $ 530.8 | $ 540.3

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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