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Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | $ 2,096,205
Accumulated goodwill impairment losses |  | (200,631)
Goodwill [Roll Forward] |  |
Balance at December 31, 2020 | $ 1,895,574 |
Foreign currency translation | (28,705) |
Acquisitions | 330,749 |
Disposition of businesses | (129) |
Acquisition adjustments | (405) |
Balance at September 30, 2021 | 2,197,084 |
FMT |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 670,442
Accumulated goodwill impairment losses |  | (20,721)
Goodwill [Roll Forward] |  |
Balance at December 31, 2020 | 649,721 |
Foreign currency translation | (7,132) |
Acquisitions | 59,481 |
Disposition of businesses | 0 |
Acquisition adjustments | (405) |
Balance at September 30, 2021 | 701,665 |
HST |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 1,012,448
Accumulated goodwill impairment losses |  | (149,820)
Goodwill [Roll Forward] |  |
Balance at December 31, 2020 | 862,628 |
Foreign currency translation | (14,168) |
Acquisitions | 271,268 |
Disposition of businesses | (129) |
Acquisition adjustments | 0 |
Balance at September 30, 2021 | 1,119,599 |
FSDP |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 413,315
Accumulated goodwill impairment losses |  | $ (30,090)
Goodwill [Roll Forward] |  |
Balance at December 31, 2020 | 383,225 |
Foreign currency translation | (7,405) |
Acquisitions | 0 |
Disposition of businesses | 0 |
Acquisition adjustments | 0 |
Balance at September 30, 2021 | $ 375,820 |

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