Goodwill Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill Roll Forward
Goodwill, Beginning Balance	$ 607,205	$ 83,333
Goodwill Additions	3,345	524,297
Goodwill, Translation Adjustments	20,662	(425)
Goodwill, Ending Balance	631,212	607,205
Global Specialty Businesses [Member]
Goodwill Roll Forward
Goodwill Period Increase Decrease	500
Americas [Member]
Goodwill Roll Forward
Goodwill Period Increase Decrease	2,600
EMEA [Member]
Goodwill Roll Forward
Goodwill Period Increase Decrease	1,400
Asia Pacific [Member]
Goodwill Roll Forward
Goodwill Period Increase Decrease	8,000
Operating Segments [Member] | Global Specialty Businesses [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	116,075	24,297
Goodwill Additions	1,329	91,545
Goodwill, Translation Adjustments	2,314	233
Goodwill, Ending Balance	119,718	116,075
Operating Segments [Member] | Americas [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	216,385	28,464
Goodwill Additions	1,485	188,494
Goodwill, Translation Adjustments	(4,628)	(573)
Goodwill, Ending Balance	213,242	216,385
Operating Segments [Member] | EMEA [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	133,018	17,423
Goodwill Additions	531	114,167
Goodwill, Translation Adjustments	6,613	1,428
Goodwill, Ending Balance	140,162	133,018
Operating Segments [Member] | Asia Pacific [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	141,727	13,149
Goodwill Additions	0	130,091
Goodwill, Translation Adjustments	16,363	(1,513)
Goodwill, Ending Balance	$ 158,090	$ 141,727