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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 |  | $ 6,252,636 | $ 1,328,045
Acquisition |  | 31,926 | 4,700,138
Impact of foreign currency fluctuations and other |  | (85,861) | 233,582
Goodwill, Ending Balance |  | 6,198,701 | 6,252,636
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 |  | 1,407,807 | 909,937
Acquisition |  | 11,297 | 497,263
Goodwill, Written off Related to Sale of Business Unit |  |  | 0
Impact of foreign currency fluctuations and other |  | (702) | 607
Goodwill, Ending Balance |  | 1,418,402 | 1,407,807
Intellectual Property Segment |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 4,844,829 | 418,108
Acquisition |  | 20,629 | 4,202,875
Goodwill, Written off Related to Sale of Business Unit |  |  | (9,129)
Impact of foreign currency fluctuations and other |  | (85,159) | 232,975
Goodwill, Ending Balance |  | $ 4,780,299 | $ 4,844,829

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