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Acquisitions - Ocean Downs (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 04, 2018 | Aug. 31, 2018 | Jul. 16, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Online real-money sports betting and iGaming agreement term |  |  | 15 years |  |  |  |  |  |
Gain on Ocean Downs/Saratoga transaction |  |  |  | $ 54.9 |  | $ 54.9 | $ 0.0 | $ 0.0 |
Cash acquired in the acquisition |  | $ 13.1 |  |  |  |  |  |  |
Repayments of assumed debt | $ 54.7 |  |  |  |  | 54.7 | 0.0 | $ 0.0 |
Goodwill |  |  |  |  |  | 20.4 | 16.1 |  |
Ocean Downs deferred tax liability |  | $ 12.6 |  |  |  |  |  |  |
Revenue since date of acquisition |  |  |  |  | $ 25.9 |  |  |  |
Ocean Downs and Racing Services |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 100.00% | 50.00% |  |  |  |  |  |
Ocean Downs LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  | 62.50%
Equity method investment, amount |  | $ 80.5 |  |  |  |  |  |  |
Saratoga New York And Saratoga Colorado |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  | 25.00%
Equity method investment, amount |  | 47.8 |  |  |  |  |  |  |
Casino |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | $ 20.4 |  |  |  | $ 20.4 | $ 0.0 |  |

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- Definition Gain on tax-efficient partial liquidation agreement for the remaining 50% ownership of the Casino at Ocean Downs and Ocean Downs Racetrack owned by Saratoga Casino Holdings LLC in exchange for the Company's 25% equity interest in SCH, which is the parent company of Saratoga Casino Hotel in Saratoga Springs, New York and Saratoga Casino Black Hawk in Black Hawk, Colorado + References No definition available. + Details
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