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Cover
Dec. 18, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 18, 2025
Entity File Number 001-31921
Entity Registrant Name Compass Minerals International, Inc.
Entity Central Index Key 0001227654
Entity Tax Identification Number 36-3972986
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 9900 West 109th Street
Entity Address, Address Line Two Suite 100
Entity Address, City or Town Overland Park
Entity Address, State or Province KS
Entity Address, Postal Zip Code 66210
City Area Code 913
Local Phone Number 344-9200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, $0.01 par value
Trading Symbol CMP
Security Exchange Name NYSE
Entity Emerging Growth Company false