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Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 31, 2018 | Jul. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Excluded from computation of diluted weighted average common shares (in shares) | 20,400 | 8,800 | 28,100 | 53,600 |  |
Share repurchase amount (no more than) |  |  |  |  | $ 125 | $ 100
Stock repurchased during period (in shares) | 371,228 | 17,328 | 585,806 | 215,860 |  |
Stock repurchase average price (in dollars per share) | $ 163.95 | $ 161.55 | $ 191.06 | $ 124.67 |  |
Decrease in weighted average shares outstanding, treasury stock (in shares) | 119,911 | 9,964 | 177,159 | 136,184 |  |
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) | 10,500 | 3,800 | 18,400 | 14,900 |  |
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) | 5,100 | 0 | 5,900 | 2,800 |  |
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) | 4,800 | 5,000 | 3,800 | 35,900 |  |

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