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Goodwill and Other Intangible Assets, Net Goodwill and Other Intangible Assets, Net - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Nov. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 5,497,596 |  | $ 5,378,388 | $ 1,156,288 | $ 1,000,123
IFF Legacy Reporting Units |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit in excess of carrying amount |  | 200.00% |  |  |
Lucas Meyers Cosmetics |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit in excess of carrying amount |  | 80.00% |  |  |
Minimum [Member] | Frutarom Reporting Units |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit in excess of carrying amount |  | 10.00% |  |  |
Maximum [Member] | Frutarom Reporting Units |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting unit in excess of carrying amount |  | 55.00% |  |  |

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