v3.26.1
FAIR VALUE MEASUREMENTS (Details) - EBP 001 - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 1,118,167,728 $ 964,082,730
Fair value, investment, NAV, redemption, notice period 15 days  
IFF Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 5,264,237 6,598,113
Vanguard Retirement Savings Trust III    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 18,095,010 18,069,288
Vanguard Target Retirement Income Trust II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 14,843,763 15,711,613
State Street U.S. Inflation Protected Bond Index Securities Lending Series Fund Class II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 5,424,168 4,740,770
State Street S&P 500 Index Securities Lending Series Fund Class II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 243,545,162 218,954,113
State Street U.S. Bond Index Securities Lending Series Fund Class XIV    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 41,281,601 37,059,594
State Street Global All Cap Equity Ex-U.S. Index Securities Lending Series Fund Class II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 66,133,285 55,565,215
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 96,693,027 49,173,137
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 60,674,279 16,143,226
Level 1 | IFF Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 5,264,237 6,598,113
Level 1 | Brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 30,754,511 26,431,798
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | IFF Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Fair Value, Inputs, Level 1, Level 2, and Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 96,693,027 49,173,137
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 60,674,279 16,143,226
Fair Value, Inputs, Level 1, Level 2, and Level 3 | IFF Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 5,264,237 6,598,113
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 30,754,511 26,431,798
Fair Value Measured at Net Asset Value Per Share    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,021,474,701 914,909,593
Fair Value Measured at Net Asset Value Per Share | Common/collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,021,474,701 914,909,593
Fair Value Measured at Net Asset Value Per Share | Vanguard Retirement Savings Trust III    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 18,095,010 18,069,288
Fair Value Measured at Net Asset Value Per Share | Vanguard Target Retirement Trust II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 632,151,712 564,809,000
Fair Value Measured at Net Asset Value Per Share | Vanguard Target Retirement Income Trust II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 14,843,763 15,711,613
Fair Value Measured at Net Asset Value Per Share | State Street U.S. Inflation Protected Bond Index Securities Lending Series Fund Class II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 5,424,168 4,740,770
Fair Value Measured at Net Asset Value Per Share | State Street S&P 500 Index Securities Lending Series Fund Class II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 243,545,162 218,954,113
Fair Value Measured at Net Asset Value Per Share | State Street U.S. Bond Index Securities Lending Series Fund Class XIV    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 41,281,601 37,059,594
Fair Value Measured at Net Asset Value Per Share | State Street Global All Cap Equity Ex-U.S. Index Securities Lending Series Fund Class II    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 66,133,285 $ 55,565,215