Business Segments - Performance of reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 435,262	$ 286,040		$ 865,045	$ 664,601
Combination and other acquisition-related expenses	(6,658)	(7,995)		(12,473)	(15,873)
Restructuring charges	(298)	(486)		(1,473)	(2,202)
Fair value step up of acquired inventory sold	0	(226)		(801)	(226)
Indefinite-lived intangible asset impairment	0	0	$ (38,000)	0	(38,000)
Non-operating and administrative expenses	(43,077)	(32,045)		(84,069)	(70,496)
Depreciation of corporate assets and amortization	(15,640)	(13,438)		(31,088)	(27,485)
Operating income (loss)	38,816	2,238		83,710	(10,206)
Other income (expense), net	14,010	(993)		18,697	(22,168)
Interest Income Expense Net	(5,618)	(6,811)		(11,088)	(15,272)
Income (loss) before taxes and equity in net income of associated companies	47,208	(5,566)		91,319	(47,646)
Americas [Member]
Segment Reporting Information [Line Items]
Net sales	185,856	112,870		365,983	286,997
EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	145,114	93,271		285,200	214,715
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	104,292	79,899		213,862	162,889
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	354,668	226,699		706,059	534,986
Segment operating earnings	104,489	56,428		213,614	144,076
Operating Segments [Member] | Global Specialty Businesses [Member]
Segment Reporting Information [Line Items]
Net sales	80,594	59,341		158,986	129,615
Segment operating earnings	24,209	16,393		48,378	36,953
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales	139,673	80,576		274,544	210,472
Segment operating earnings	33,648	10,303		65,882	39,491
Operating Segments [Member] | Americas [Member] | Global Specialty Businesses [Member]
Segment Reporting Information [Line Items]
Net sales	46,183	32,294		91,439	76,525
Operating Segments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	123,436	77,702		243,250	182,541
Segment operating earnings	23,405	10,471		48,649	28,830
Operating Segments [Member] | EMEA [Member] | Global Specialty Businesses [Member]
Segment Reporting Information [Line Items]
Net sales	21,678	15,569		41,950	32,174
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	91,559	68,421		188,265	141,973
Segment operating earnings	23,227	19,261		50,705	38,802
Operating Segments [Member] | Asia Pacific [Member] | Global Specialty Businesses [Member]
Segment Reporting Information [Line Items]
Net sales	12,733	11,478		25,597	20,916
Intersegment Elimination [Member] | Global Specialty Businesses [Member]
Segment Reporting Information [Line Items]
Net sales	2,100	1,000		4,100	2,300
Intersegment Elimination [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales	2,400	2,400		5,700	5,300
Intersegment Elimination [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	6,300	5,300		15,100	10,800
Intersegment Elimination [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	$ 400	$ 100		$ 500	$ 300