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Other Intangible Assets, net and Goodwill - Change in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 06, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | $ 6,042,964 | $ 1,328,045
Acquisition |  | 31,926 | 4,501,894
Impact of foreign currency fluctuations and other |  | (75,568) | 222,154
Goodwill, Ending Balance |  | 5,999,322 | 6,042,964
CPA Global |  |  |
Goodwill [Line Items] |  |  |
Decrease to goodwill, purchase accounting adjustments |  | 20,493 |
IncoPat |  |  |
Goodwill [Line Items] |  |  |
Decrease to goodwill, purchase accounting adjustments |  | 136 |
Discontinued Operations, Disposed of by Sale | Brand Protection, AntiPiracy, and AntiFraud Solutions |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | (9,129)
Discontinued Operations, Disposed of by Sale | Techstreet Business |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Written off Related to Sale of Business Unit | $ (9,129) |  |
Science Segment |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 1,409,743 | 909,937
Acquisition |  | 11,297 | 499,199
Goodwill, Written off Related to Sale of Business Unit |  |  | 0
Impact of foreign currency fluctuations and other |  | 1,015 | 607
Goodwill, Ending Balance |  | 1,422,055 | 1,409,743
Intellectual Property Segment (As Restated) |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 4,633,221 | 418,108
Acquisition |  | 20,629 | 4,002,695
Goodwill, Written off Related to Sale of Business Unit |  |  | (9,129)
Impact of foreign currency fluctuations and other |  | (76,583) | 221,547
Goodwill, Ending Balance |  | $ 4,577,267 | $ 4,633,221

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