Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net earnings of Flowserve Corporation	$ 68,443	$ 28,205	$ 183,875	$ 56,568
Dividends on restricted shares not expected to vest	0	0	0	0
Earnings attributable to common and participating shareholders	$ 68,443	$ 28,205	$ 183,875	$ 56,568
Weighted average shares:
Common stock (in shares)	131,122	130,823	131,070	130,784
Participating securities (in shares)	23	20	22	32
Denominator for basic earnings per common share (in shares)	131,145	130,843	131,092	130,816
Effect of potentially dilutive securities (in shares)	701	507	605	408
Denominator for diluted earnings per common share (in shares)	131,846	131,350	131,697	131,224
Earnings per common share:
Basic (in dollars per share)	$ 0.52	$ 0.22	$ 1.40	$ 0.43
Diluted (in dollars per share)	$ 0.52	$ 0.21	$ 1.40	$ 0.43