Net Sales and Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Product Information [Line Items]
Net sales	$ 286,040	$ 205,869	$ 664,601	$ 417,079
America's [Member]
Product Information [Line Items]
Net sales	80,576	71,747	210,472	143,972
EMEA [Member]
Product Information [Line Items]
Net sales	77,702	49,012	182,541	101,437
Asia Pacific [Member]
Product Information [Line Items]
Net sales	68,421	44,801	141,973	90,968
Transferred At Point In Time [Member]
Product Information [Line Items]
Net sales	274,834	201,557	643,215	407,989
Transferred At Point In Time [Member] | America's [Member]
Product Information [Line Items]
Net sales	108,644	100,053	277,446	201,600
Transferred At Point In Time [Member] | EMEA [Member]
Product Information [Line Items]
Net sales	87,995	53,098	206,418	109,332
Transferred At Point In Time [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	78,195	48,406	159,351	97,057
Transferred Over Time [Member]
Product Information [Line Items]
Net sales	11,206	4,312	21,386	9,090
Transferred Over Time [Member] | America's [Member]
Product Information [Line Items]
Net sales	4,226	2,839	9,551	5,687
Transferred Over Time [Member] | EMEA [Member]
Product Information [Line Items]
Net sales	5,276	52	8,297	106
Transferred Over Time [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	1,704	1,421	3,538	3,297
Primary Metals [Member]
Product Information [Line Items]
Net sales	93,027	92,382	211,177	187,236
Primary Metals [Member] | America's [Member]
Product Information [Line Items]
Net sales	32,687	39,506	79,360	80,431
Primary Metals [Member] | EMEA [Member]
Product Information [Line Items]
Net sales	24,924	24,485	54,812	49,201
Primary Metals [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	35,416	28,391	77,005	57,604
Metalworking and other[Member]
Product Information [Line Items]
Net sales	133,672	73,178	323,809	149,141
Metalworking and other[Member] | America's [Member]
Product Information [Line Items]
Net sales	47,889	32,241	131,112	63,541
Metalworking and other[Member] | EMEA [Member]
Product Information [Line Items]
Net sales	52,778	24,527	127,729	52,236
Metalworking and other[Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	33,005	16,410	64,968	33,364
Global Specialty Businesses [Member]
Product Information [Line Items]
Net sales	59,341	40,309	129,615	80,702
Global Specialty Businesses [Member] | America's [Member]
Product Information [Line Items]
Net sales	32,294	31,145	76,525	63,315
Global Specialty Businesses [Member] | EMEA [Member]
Product Information [Line Items]
Net sales	15,569	4,138	32,174	8,001
Global Specialty Businesses [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	11,478	5,026	20,916	9,386
Total sales with Global Specialty Businesses [Member]
Product Information [Line Items]
Net sales	286,040	205,869	664,601	417,079
Total sales with Global Specialty Businesses [Member] | America's [Member]
Product Information [Line Items]
Net sales	112,870	102,892	286,997	207,287
Total sales with Global Specialty Businesses [Member] | EMEA [Member]
Product Information [Line Items]
Net sales	93,271	53,150	214,715	109,438
Total sales with Global Specialty Businesses [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	79,899	49,827	162,889	100,354
Total sales without Global Specialty Businesses [Member]
Product Information [Line Items]
Net sales	226,699	165,560	534,986	336,377
Total sales without Global Specialty Businesses [Member] | America's [Member]
Product Information [Line Items]
Net sales	80,576	71,747	210,472	143,972
Total sales without Global Specialty Businesses [Member] | EMEA [Member]
Product Information [Line Items]
Net sales	77,702	49,012	182,541	101,437
Total sales without Global Specialty Businesses [Member] | Asia Pacific [Member]
Product Information [Line Items]
Net sales	$ 68,421	$ 44,801	$ 141,973	$ 90,968