v3.26.1
Fair Value Measurements (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 178,223,190 $ 164,923,939
Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 6,328,878 6,819,993
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 50,746,641 48,542,002
Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,869,779 1,909,790
Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 117,720,134 106,647,954
Compass Minerals common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,557,758 1,004,200
Stock Purchase Account    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 706 638
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 178,223,190 164,923,939
Level 1 | Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 6,328,878 6,819,993
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 50,746,641 48,542,002
Level 1 | Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,869,779 1,909,790
Level 1 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 117,720,134 106,647,954
Level 1 | Compass Minerals common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,557,758 1,004,200
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 2 | Compass Minerals common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Money Market Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Self-directed brokerage account    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Common collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Level 3 | Compass Minerals common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 0 $ 0