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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Earnings Per Share [Abstract]            
Net earnings of Flowserve Corporation $ 49,785 $ 56,051 $ 56,115 $ 109,218 $ 74,369 $ 130,420
Dividends on restricted shares not expected to vest 0   0 0 0  
Earnings attributable to common and participating shareholders $ 49,785   $ 56,115 $ 109,218 $ 74,369  
Weighted average shares:            
Common stock (in shares) 130,210   130,292 130,298 130,390  
Participating securities (in shares) 32   21 27 23  
Denominator for basic earnings per common share (in shares) 130,242   130,313 130,325 130,413  
Effect of potentially dilutive securities (in shares) 547   587 542 655  
Denominator for diluted earnings per common share (in shares) 130,789   130,900 130,867 131,068  
Earnings per common share:            
Basic (in dollars per share) $ 0.38 $ 0.43 $ 0.43 $ 0.84 $ 0.57 $ 1.00
Diluted (in dollars per share) $ 0.38 $ 0.43 $ 0.43 $ 0.83 $ 0.57 $ 1.00