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Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	May 05, 2020	Feb. 28, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Decrease in weighted average number of shares outstanding treasury stock	461
2020 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase authorized amount		$ 200,000,000
Stock repurchased during period (in shares)	14,906
Stock repurchase average price (in dollars per share)	$ 204.48
Remaining repurchase amount	$ 243,000,000
2019 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase authorized amount			$ 125,000,000

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