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Net Income Attributable to IPG Photonics Corporation Per Share (Anti Dilutive Shares Excluded From EPS) (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded from computation of diluted weighted average common shares (in shares) 277,400 871,000
Stock Options | Non-qualified Plan    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded from computation of diluted weighted average common shares (in shares) 202,500 622,700
Restricted Stock Units, RSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded from computation of diluted weighted average common shares (in shares) 61,100 198,000
Performance Stock Units, PSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded from computation of diluted weighted average common shares (in shares) 13,800 50,300