Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net earnings (loss) of Flowserve Corporation	$ (610)	$ 57,261
Dividends on restricted shares not expected to vest	0	0
Earnings (loss) attributable to common and participating shareholders	$ (610)	$ 57,261
Weighted average shares:
Common stock (in shares)	130,731,000	130,962,000
Participating securities (in shares)	0	20,000
Denominator for basic earnings per common share (in shares)	130,731,000	130,982,000
Effect of potentially dilutive securities (in shares)	0	550,000
Denominator for diluted earnings per common share (in shares)	130,731,000	131,532,000
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0	$ 0.44
Diluted (in dollars per share)	$ 0	$ 0.44
Antidilutive shares (in shares)	842,506