Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net earnings of Flowserve Corporation	$ 44,777	$ 45,354	$ 28,960	$ 59,434
Dividends on restricted shares not expected to vest	0	0	0	0
Earnings attributable to common and participating shareholders	$ 44,777	$ 45,354	$ 28,960	$ 59,434
Weighted average shares:
Common stock (in shares)	130,626,000	130,279,000	130,518,000	130,342,000
Participating securities (in shares)	40,000	26,000	36,000	24,000
Denominator for basic earnings per common share (in shares)	130,666,000	130,305,000	130,554,000	130,366,000
Effect of potentially dilutive securities (in shares)	579,000	499,000	594,000	539,000
Denominator for diluted earnings per common share (in shares)	131,245,000	130,804,000	131,148,000	130,905,000
Earnings per common share:
Basic (in dollars per share)	$ 0.34	$ 0.35	$ 0.22	$ 0.46
Diluted (in dollars per share)	$ 0.34	$ 0.35	$ 0.22	$ 0.45