Realignment Programs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended		63 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6,047	$ 1,045		$ 19,334	$ (13,476)
Non-Restructuring Charges	1,384	3,749		52,983	12,644
Total Realignment Program Charges	7,431	4,794		72,317	(832)
Transformation Charges	4,746	5,058		16,007	21,044
Total Realignment and Transformation Charges	12,177	9,852		88,324	20,212
Restructuring Reserve [Roll Forward]
Beginning Balance				6,703	11,927
Charges, net of adjustments	6,047	1,045		19,334	(13,476)
Cash expenditures				(4,772)	(8,196)
Other non-cash adjustments, including currency				425	(461)
Ending Balance	20,342	9,087	$ 20,342	20,342	9,087
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,688	(738)		17,187	2,708
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	4,688	(738)		17,187	2,708
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	3		0	51
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	0	3		0	51
Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	334	24		1,347	(19,295)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	334	24		1,347	(19,295)
Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,025	1,756		800	3,060
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	1,025	1,756		800	3,060
Charges Expected to be Settled in Cash
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				17,986	5,817
Restructuring Reserve [Roll Forward]
Charges, net of adjustments				17,986	5,817
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6,059	1,008		19,118	3,183
Non-Restructuring Charges	(401)	2,412		21,518	9,603
Total Realignment Program Charges	5,658	3,420		40,636	12,786
Total Realignment and Transformation Charges	5,658	3,420		40,636	12,786
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	6,059	1,008		19,118	3,183
Cost of Sales | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,704	(729)		16,959	1,099
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	4,704	(729)		16,959	1,099
Cost of Sales | Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	3		0	51
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	0	3		0	51
Cost of Sales | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	331	19		1,322	(799)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	331	19		1,322	(799)
Cost of Sales | Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,024	1,715		837	2,832
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	1,024	1,715		837	2,832
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(12)	37		216	(16,659)
Non-Restructuring Charges	1,785	1,337		31,465	3,041
Total Realignment Program Charges	1,773	1,374		31,681	(13,618)
Transformation Charges	4,746	5,058		16,007	21,044
Total Realignment and Transformation Charges	6,519	6,432		47,688	7,426
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	(12)	37		216	(16,659)
Selling, General and Administrative Expenses | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(16)	(9)		228	1,609
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	(16)	(9)		228	1,609
Selling, General and Administrative Expenses | Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	0			0
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	0	0			0
Selling, General and Administrative Expenses | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3	5		25	(18,496)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	3	5		25	(18,496)
Selling, General and Administrative Expenses | Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1	41		(37)	228
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	1	41		(37)	228
FPD
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5,459	234		19,021	(15,180)
Non-Restructuring Charges	2,307	2,752		24,238	10,301
Total Realignment Program Charges	7,766	2,986		43,259	(4,879)
Total Realignment and Transformation Charges	7,766	2,986		43,259	(4,879)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	5,459	234		19,021	(15,180)
FPD | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5,469	197		18,800	1,892
Non-Restructuring Charges	1,210	2,409		13,339	9,531
Total Realignment Program Charges	6,679	2,606		32,139	11,423
Total Realignment and Transformation Charges	6,679	2,606		32,139	11,423
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	5,469	197		18,800	1,892
FPD | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(10)	37		221	(17,072)
Non-Restructuring Charges	1,097	343		10,899	770
Total Realignment Program Charges	1,087	380		11,120	(16,302)
Total Realignment and Transformation Charges	1,087	380		11,120	(16,302)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	(10)	37		221	(17,072)
FCD
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	588	811		313	1,704
Non-Restructuring Charges	(1,291)	3		12,335	106
Total Realignment Program Charges	(703)	814		12,648	1,810
Total Realignment and Transformation Charges	(703)	814		12,648	1,810
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	588	811		313	1,704
FCD | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	590	811		318	1,291
Non-Restructuring Charges	(1,366)	3		7,876	72
Total Realignment Program Charges	(776)	814		8,194	1,363
Total Realignment and Transformation Charges	(776)	814		8,194	1,363
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	590	811		318	1,291
FCD | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(2)	0		(5)	413
Non-Restructuring Charges	75	0		4,459	34
Total Realignment Program Charges	73	0		4,454	447
Total Realignment and Transformation Charges	73	0		4,454	447
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	(2)	0		(5)	413
Subtotal–Reportable Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6,047	1,045		19,334	(13,476)
Non-Restructuring Charges	1,016	2,755		36,573	10,407
Total Realignment Program Charges	7,063	3,800		55,907	(3,069)
Total Realignment and Transformation Charges	7,063	3,800		55,907	(3,069)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	6,047	1,045		19,334	(13,476)
Subtotal–Reportable Segments | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6,059	1,008		19,118	3,183
Non-Restructuring Charges	(156)	2,412		21,215	9,603
Total Realignment Program Charges	5,903	3,420		40,333	12,786
Total Realignment and Transformation Charges	5,903	3,420		40,333	12,786
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	6,059	1,008		19,118	3,183
Subtotal–Reportable Segments | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	(12)	37		216	(16,659)
Non-Restructuring Charges	1,172	343		15,358	804
Total Realignment Program Charges	1,160	380		15,574	(15,855)
Total Realignment and Transformation Charges	1,160	380		15,574	(15,855)
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	(12)	37		216	(16,659)
Eliminations and All Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	0		0	0
Non-Restructuring Charges	368	994		16,410	2,237
Total Realignment Program Charges	368	994		16,410	2,237
Transformation Charges	4,746	5,058		16,007	21,044
Total Realignment and Transformation Charges	5,114	6,052		32,417	23,281
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	0	0		0	0
Eliminations and All Other | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	0		0	0
Non-Restructuring Charges	(245)	0		303	0
Total Realignment Program Charges	(245)	0		303	0
Total Realignment and Transformation Charges	(245)	0		303	0
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	0	0		0	0
Eliminations and All Other | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	0		0	0
Non-Restructuring Charges	613	994		16,107	2,237
Total Realignment Program Charges	613	994		16,107	2,237
Transformation Charges	4,746	5,058		16,007	21,044
Total Realignment and Transformation Charges	5,359	6,052		32,114	23,281
Restructuring Reserve [Roll Forward]
Charges, net of adjustments	0	$ 0		0	$ 0
Flowserve 2.0 Transformation
Restructuring Cost and Reserve [Line Items]
Expected cost	$ 75,000		75,000	$ 75,000
Restructuring Charges			17,680
Non-Restructuring Charges			45,332
Total Realignment and Transformation Charges			63,012
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			17,680
Flowserve 2.0 Transformation | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			15,386
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			15,386
Flowserve 2.0 Transformation | Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			0
Flowserve 2.0 Transformation | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1,352
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			1,352
Flowserve 2.0 Transformation | Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			942
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			942
Flowserve 2.0 Transformation | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			17,542
Non-Restructuring Charges			15,067
Total Realignment and Transformation Charges			32,609
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			17,542
Flowserve 2.0 Transformation | Cost of Sales | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			15,276
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			15,276
Flowserve 2.0 Transformation | Cost of Sales | Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			0
Flowserve 2.0 Transformation | Cost of Sales | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1,325
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			1,325
Flowserve 2.0 Transformation | Cost of Sales | Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			941
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			941
Flowserve 2.0 Transformation | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			138
Non-Restructuring Charges			30,265
Total Realignment and Transformation Charges			30,403
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			138
Flowserve 2.0 Transformation | Selling, General and Administrative Expenses | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			110
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			110
Flowserve 2.0 Transformation | Selling, General and Administrative Expenses | Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			0
Flowserve 2.0 Transformation | Selling, General and Administrative Expenses | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			27
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			27
Flowserve 2.0 Transformation | Selling, General and Administrative Expenses | Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			1
Flowserve 2.0 Transformation | FPD
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			17,235
Non-Restructuring Charges			23,626
Total Realignment and Transformation Charges			40,861
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			17,235
Flowserve 2.0 Transformation | FPD | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			17,119
Non-Restructuring Charges			13,213
Total Realignment and Transformation Charges			30,332
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			17,119
Flowserve 2.0 Transformation | FPD | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			116
Non-Restructuring Charges			10,413
Total Realignment and Transformation Charges			10,529
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			116
Flowserve 2.0 Transformation | FCD
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			445
Non-Restructuring Charges			5,938
Total Realignment and Transformation Charges			6,383
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			445
Flowserve 2.0 Transformation | FCD | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			423
Non-Restructuring Charges			1,551
Total Realignment and Transformation Charges			1,974
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			423
Flowserve 2.0 Transformation | FCD | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			22
Non-Restructuring Charges			4,387
Total Realignment and Transformation Charges			4,409
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			22
Flowserve 2.0 Transformation | Subtotal–Reportable Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			17,680
Non-Restructuring Charges			29,564
Total Realignment and Transformation Charges			47,244
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			17,680
Flowserve 2.0 Transformation | Subtotal–Reportable Segments | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			17,542
Non-Restructuring Charges			14,764
Total Realignment and Transformation Charges			32,306
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			17,542
Flowserve 2.0 Transformation | Subtotal–Reportable Segments | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			138
Non-Restructuring Charges			14,800
Total Realignment and Transformation Charges			14,938
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			138
Flowserve 2.0 Transformation | Eliminations and All Other
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Non-Restructuring Charges			15,768
Total Realignment and Transformation Charges			15,768
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			0
Flowserve 2.0 Transformation | Eliminations and All Other | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Non-Restructuring Charges			303
Total Realignment and Transformation Charges			303
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			0
Flowserve 2.0 Transformation | Eliminations and All Other | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Non-Restructuring Charges			15,465
Total Realignment and Transformation Charges			15,465
Restructuring Reserve [Roll Forward]
Charges, net of adjustments			$ 0
Realignment Programs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges						$ 362,400
Restructuring Reserve [Roll Forward]
Charges, net of adjustments						$ 362,400