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Segment Information - Schedule of Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 219.0 | $ 221.3 | $ 379.4 | $ 189.3 | $ 178.9 | $ 196.9 | $ 339.3 | $ 167.5 | $ 1,009.0 | $ 882.6 | $ 822.4
Adjusted EBITDA |  |  |  |  |  |  |  |  | 328.8 | 286.2 | 252.3
Racing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 274.3 | 257.3 | 251.1
Adjusted EBITDA |  |  |  |  |  |  |  |  | 92.4 | 84.5 | 79.7
Online Wagering |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 290.2 | 255.6 | 221.6
Adjusted EBITDA |  |  |  |  |  |  |  |  | 72.8 | 64.4 | 56.2
Casino |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 411.2 | 350.5 | 332.8
Adjusted EBITDA |  |  |  |  |  |  |  |  | 169.5 | 146.0 | 125.8
Other Investments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 33.3 | 19.2 | 16.9
Adjusted EBITDA |  |  |  |  |  |  |  |  | 5.3 | 3.7 | 2.7
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  | (11.2) | (12.4) | (12.1)
Operating Segments | Racing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 295.4 | 276.6 | 268.1
Taxes & purses |  |  |  |  |  |  |  |  | (67.3) | (65.4) | (64.2)
Marketing & advertising |  |  |  |  |  |  |  |  | (6.5) | (4.9) | (4.6)
Salaries & benefits |  |  |  |  |  |  |  |  | (44.0) | (41.7) | (40.9)
Content expense |  |  |  |  |  |  |  |  | (14.4) | (15.2) | (15.6)
SG&A expense |  |  |  |  |  |  |  |  | (17.8) | (16.8) | (16.2)
Other operating expense |  |  |  |  |  |  |  |  | (53.6) | (48.9) | (47.4)
Other income |  |  |  |  |  |  |  |  | 0.6 | 0.8 | 0.5
Adjusted EBITDA |  |  |  |  |  |  |  |  | 92.4 | 84.5 | 79.7
Operating Segments | Online Wagering |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 291.5 | 256.7 | 222.9
Taxes & purses |  |  |  |  |  |  |  |  | (15.2) | (14.7) | (11.6)
Marketing & advertising |  |  |  |  |  |  |  |  | (6.0) | (8.2) | (6.3)
Salaries & benefits |  |  |  |  |  |  |  |  | (9.2) | (9.9) | (9.4)
Content expense |  |  |  |  |  |  |  |  | (152.0) | (125.0) | (107.6)
SG&A expense |  |  |  |  |  |  |  |  | (12.1) | (12.4) | (12.0)
Other operating expense |  |  |  |  |  |  |  |  | (24.2) | (22.1) | (19.8)
Other income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Adjusted EBITDA |  |  |  |  |  |  |  |  | 72.8 | 64.4 | 56.2
Operating Segments | Casino |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 411.2 | 350.5 | 332.8
Taxes & purses |  |  |  |  |  |  |  |  | (139.9) | (117.0) | (110.9)
Marketing & advertising |  |  |  |  |  |  |  |  | (14.7) | (12.1) | (12.7)
Salaries & benefits |  |  |  |  |  |  |  |  | (58.5) | (53.2) | (50.8)
Content expense |  |  |  |  |  |  |  |  | (0.3) | 0.0 | 0.0
SG&A expense |  |  |  |  |  |  |  |  | (26.1) | (22.6) | (21.2)
Other operating expense |  |  |  |  |  |  |  |  | (45.5) | (41.6) | (39.1)
Other income |  |  |  |  |  |  |  |  | 43.3 | 42.0 | 27.7
Adjusted EBITDA |  |  |  |  |  |  |  |  | 169.5 | 146.0 | 125.8
Operating Segments | Other Investments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 37.8 | 23.7 | 20.8
Taxes & purses |  |  |  |  |  |  |  |  | (4.3) | 0.0 | 0.0
Marketing & advertising |  |  |  |  |  |  |  |  | (1.0) | 0.0 | 0.0
Salaries & benefits |  |  |  |  |  |  |  |  | (15.0) | (12.0) | (10.9)
Content expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
SG&A expense |  |  |  |  |  |  |  |  | (5.3) | (3.3) | (3.4)
Other operating expense |  |  |  |  |  |  |  |  | (7.0) | (5.1) | (4.1)
Other income |  |  |  |  |  |  |  |  | 0.1 | 0.4 | 0.3
Adjusted EBITDA |  |  |  |  |  |  |  |  | 5.3 | 3.7 | 2.7
Operating Segments | Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Taxes & purses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Marketing & advertising |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Salaries & benefits |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Content expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
SG&A expense |  |  |  |  |  |  |  |  | (11.0) | (12.2) | (11.7)
Other operating expense |  |  |  |  |  |  |  |  | (0.4) | (0.5) | (0.6)
Other income |  |  |  |  |  |  |  |  | 0.2 | 0.3 | 0.2
Adjusted EBITDA |  |  |  |  |  |  |  |  | $ (11.2) | (12.4) | (12.1)
Big Fish Games | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA corporate and other expenses |  |  |  |  |  |  |  |  |  |  | 3.1
Big Fish Games | Discontinued Operations, Held-for-sale | Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA corporate and other expenses |  |  |  |  |  |  |  |  |  | $ 3.6 | $ 3.1

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