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Project Summit - Restructuring Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020
Restructuring Reserve [Roll Forward] |  |  |  |  |
Amounts accrued | $ 48,371 | $ 0 | $ 128,715 | $ 0 | $ 177,312
Project Summit costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance as of December 31, 2019 |  |  | 17,777 |  |
Amounts accrued |  |  | 128,715 |  |
Payments |  |  | (97,646) |  |
Other, including currency translation adjustments |  |  | (3,604) |  |
Balance as of September 30, 2020 | 45,242 |  | 45,242 |  | 45,242
Accrued professional fees | Project Summit costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance as of December 31, 2019 |  |  | 13,000 |  |
Balance as of September 30, 2020 | 33,400 |  | 33,400 |  | 33,400
Accrued employee severance costs | Project Summit costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance as of December 31, 2019 |  |  | 4,800 |  |
Balance as of September 30, 2020 | $ 11,800 |  | $ 11,800 |  | $ 11,800

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