Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net earnings of Flowserve Corporation	$ 51,003	$ 59,842	$ 59,433	$ 166,243
Dividends on restricted shares not expected to vest	0	0	0	0
Earnings attributable to common and participating shareholders	$ 51,003	$ 59,842	$ 59,433	$ 166,243
Weighted average shares:
Common stock (in shares)	130,292	131,122	130,390	131,070
Participating securities (in shares)	21	23	23	22
Denominator for basic earnings per common share (in shares)	130,313	131,145	130,413	131,092
Effect of potentially dilutive securities (in shares)	587	701	655	605
Denominator for diluted earnings per common share (in shares)	130,900	131,846	131,068	131,697
Earnings per common share:
Basic (in dollars per share)	$ 0.39	$ 0.46	$ 0.46	$ 1.27
Diluted (in dollars per share)	$ 0.39	$ 0.45	$ 0.45	$ 1.26