Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($)
Goodwill Roll Forward
Goodwill, Beginning Balance	$ 631,212
Goodwill Additions	7,093
Currency translation and other adjustments	(7,636)
Goodwill, Ending Balance	630,669
Operating Segments [Member] \| Global Specialty Businesses [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	119,718
Goodwill Additions	1,951
Currency translation and other adjustments	(2,594)
Goodwill, Ending Balance	119,075
Operating Segments [Member] \| Americas [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	213,242
Goodwill Additions	1,208
Currency translation and other adjustments	(621)
Goodwill, Ending Balance	213,829
Operating Segments [Member] \| EMEA [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	140,162
Goodwill Additions	2,626
Currency translation and other adjustments	(5,530)
Goodwill, Ending Balance	137,258
Operating Segments [Member] \| Asia Pacific [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	158,090
Goodwill Additions	1,308
Currency translation and other adjustments	1,109
Goodwill, Ending Balance	$ 160,507

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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