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Discontinued Operations (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 09, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Aug. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  | $ 219.5 |  |  |
Proceeds from sale of Big Fish Games |  |  |  | 970.7 | $ 0.0 |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents | $ 0.3 |  |  |  |  |  |
Stock-based compensation |  | $ 3.9 | $ 3.9 | 16.5 | 17.5 |  |
Disposal Group, Including Discontinued Operations, Transaction Expense |  |  |  | 14.1 |  |  |
Gain (Loss) on Disposition of Business |  |  |  | 219.5 | 0.0 |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | 34.7 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Game Software Development, Net, Current | 6.7 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Current | 17.0 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent | 17.8 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Game Software Development, Net, Noncurrent | 13.8 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent | 530.7 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent | 238.4 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent | 24.0 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | (8.5) |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | (22.6) |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Deferred Revenue, Current | (44.2) |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities | (52.0) |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | (4.9) |  |  |  |  |  |
Carrying Value of Disposal Group | 751.2 |  |  |  |  |  |
Earnout Payment, Financing Activity |  |  |  |  |  | $ 5.2 | $ 34.2
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  | 51.2 |  |  |
Other Adjustments to Income, Discontinued Operations |  |  |  | 5.2 |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  | $ 168.3
Big Fish Games [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of Big Fish Games | $ 990.0 |  |  |  |  |  |
Stock-based compensation |  |  |  | 3.4 |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  | 0.0 | 118.0 | 13.2 | 342.5 |  |
Disposal Group, Including Discontinued Operation, Operating Expense |  | 0.0 | 95.3 | 8.4 | 271.5 |  |
Disposal Group, Including Discontinued Operation, General and Administrative Expense |  | 0.7 | 6.7 | 5.6 | 18.9 |  |
Disposal Group, Including Discontinued Operations, Research And Development Expense |  | 0.0 | 9.8 | 0.9 | 30.0 |  |
Disposal Group, Including Discontinued Operations, Transaction Expense |  | 0.0 | 0.2 | 0.0 | 0.6 |  |
Disposal Group, Including Discontinued Operations, Total Operating Expense |  | 0.7 | 112.0 | 14.9 | 321.0 |  |
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  | (0.7) | 6.0 | (1.7) | 21.5 |  |
Disposal Group, Including Discontinued Operation, Other Expense |  | 0.0 | (1.2) | (0.1) | (1.6) |  |
Disposal Group, Including Discontinued Operation, Other Income |  | 0.0 | (1.2) | 219.4 | (1.6) |  |
Gain (Loss) on Disposition of Business |  | 0.0 | 0.0 | 219.5 | 0.0 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax |  | (0.7) | 4.8 | 217.7 | 19.9 |  |
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period |  | (1.0) | (1.2) | (51.6) | (5.6) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  | $ (1.7) | $ 3.6 | $ 166.1 | $ 14.3 |  |

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