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Restructuring and Other Charges, Net - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Facility Position | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Facility | Dec. 31, 2019 Position
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of facilities closed | Facility |  |  |  |  | 21 |
Restructuring Charges | $ 6.0 | $ 1.0 | $ 34.0 | $ 8.0 |  |
Severance Costs | 22.0 | $ 0.0 | 28.0 | $ 0.0 |  |
Restructuring Reserve | 36.0 |  | 36.0 |  | $ 14.0 |
Additional Charges (Reversals), Net |  |  | $ 34.0 |  |  |
Frutarom Integration Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected number of sites closed | Facility |  |  | 30 |  |  |
Number of facilities closed | Facility |  |  | 1 |  |  |
Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of positions expected to be eliminated | Position |  |  | 200 |  |  |
Restructuring Reserve | 1.0 |  | $ 1.0 |  | 2.0 |
Additional Charges (Reversals), Net |  |  | 0.0 |  |  |
Employee Severance | Nutrition & Biosciences, Inc |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 23.0 |  | 23.0 |  | 0.0 |
Additional Charges (Reversals), Net |  |  | $ 26.0 |  |  |
Employee Severance | Frutarom Integration Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of facilities closed | Facility |  |  | 22 |  |  |
Restructuring Charges |  |  | $ 34.0 |  |  |
Payments for restructuring |  |  | 43.0 |  |  |
Restructuring Reserve | 4.0 |  | 4.0 |  | 3.0 |
Additional Charges (Reversals), Net |  |  | 3.0 |  |  |
Employee Severance | 2019 Severance Initiatives |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  | 21.0 |  |  |
Number of positions expected to be eliminated | Position |  |  |  |  |  | 190
Restructuring Reserve | 5.0 |  | 5.0 |  | 6.0 |
Additional Charges (Reversals), Net |  |  | 0.0 |  |  |
Other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 0.0 |  | 0.0 |  | 0.0 |
Additional Charges (Reversals), Net |  |  | 1.0 |  |  |
Other | Frutarom Integration Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 3.0 |  | 3.0 |  | $ 3.0 |
Additional Charges (Reversals), Net |  |  | $ 0.0 |  |  |

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