Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2020		Sep. 30, 2020		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net earnings of Flowserve Corporation	$ 16,700		$ 49,800		$ 45,400		$ 14,100		$ 56,051		$ 56,100		$ 6,100		$ 12,100		$ 125,949	$ 130,420	$ 238,828
Dividends on restricted shares not expected to vest																	0	0	0
Earnings attributable to common and participating shareholders																	$ 125,949	$ 130,420	$ 238,828
Weighted average shares:
Common stock (in shares)																	130,277,000	130,373,000	131,012,000
Participating securities (in shares)																	28,000	22,000	22,000
Denominator for basic earnings per common share (in shares)																	130,305,000	130,395,000	131,034,000
Effect of potentially dilutive securities (in shares)																	552,000	655,000	685,000
Denominator for diluted earnings per common share (in shares)																	130,857,000	131,050,000	131,719,000
Earnings per common share:
Basic (in dollars per share)	$ 0.13	[1]	$ 0.38	[1]	$ 0.35	[1]	$ 0.11	[1]	$ 0.43	[1]	$ 0.43	[1]	$ 0.05	[1]	$ 0.09	[1]	$ 0.97	$ 1.00	$ 1.82
Diluted (in dollars per share)	$ 0.13	[1]	$ 0.38	[1]	$ 0.35	[1]	$ 0.11	[1]	$ 0.43	[1]	$ 0.43	[1]	$ 0.05	[1]	$ 0.09	[1]	$ 0.96	$ 1.00	$ 1.81
Antidilutive shares (in shares)																	156,578	375,203	140,459
Litigation Settlement, Expense																	$ 10,000	$ 15,800	$ 20,900

[1] Earnings per share is computed independently for each of the quarters presented. The sum of the quarters may not equal the total year amount due to the impact of changes in weighted average quarterly shares outstanding or rounding.