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Discontinued Operations - Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 09, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transaction expense, net | $ 14.1 |  |  |
Gain on sale of Big Fish Games | $ 219.5 |  |  |
Big Fish Games | Discontinued Operations, Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net revenue |  | $ 13.2 |  |
Operating expenses |  | 8.4 |  |
Selling, general and administrative expense |  | 6.0 |  |
Research and development |  | 0.9 |  |
Transaction expense, net |  | 0.0 |  |
Total operating expense |  | 15.3 |  |
Operating (loss) income |  | (2.1) |  |
Gain on sale of Big Fish Games |  | 219.5 |  |
Other expense |  | 0.1 |  |
Total other income (loss) |  | 219.6 |  |
Income from discontinued operations before provision for income taxes |  | 217.5 |  |
Income tax provision |  | (47.3) |  |
Income from discontinued operations, net of tax |  | $ 170.2 |  |
Big Fish Games | Discontinued Operations, Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net revenue |  |  | $ 466.0 | $ 486.2
Operating expenses |  |  | 369.0 | 398.9
Selling, general and administrative expense |  |  | 27.8 | 20.9
Research and development |  |  | 39.6 | 39.0
Transaction expense, net |  |  | 4.7 | 5.8
Total operating expense |  |  | 441.1 | 464.6
Operating (loss) income |  |  | 24.9 | 21.6
Gain on sale of Big Fish Games |  |  | 0.0 | 0.0
Other expense |  |  | (1.7) | (0.9)
Total other income (loss) |  |  | (1.7) | (0.9)
Income from discontinued operations before provision for income taxes |  |  | 23.2 | 20.7
Income tax provision |  |  | (5.1) | (9.3)
Income from discontinued operations, net of tax |  |  | $ 18.1 | $ 11.4

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