Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Net earnings of Flowserve Corporation	$ 219,582	$ 58,382	$ 375,241	$ 205,218
Earnings attributable to common and participating shareholders	$ 219,582	$ 58,382	$ 375,241	$ 205,218
Weighted average shares:
Common stock (in shares)	130,287,000	131,363,000	130,880,000	131,480,000
Participating securities (in shares)	28,000	32,000	30,000	40,000
Denominator for basic earnings per common share (in shares)	130,315,000	131,395,000	130,910,000	131,520,000
Effect of potentially dilutive securities (in shares)	920,000	852,000	926,000	823,000
Denominator for diluted earnings per common share (in shares)	131,235,000	132,247,000	131,836,000	132,343,000
Earnings per common share:
Basic (in dollars per share)	$ 1.69	$ 0.44	$ 2.87	$ 1.56
Diluted (in dollars per share)	$ 1.67	$ 0.44	$ 2.85	$ 1.55