0001227654 2020-12-26 2020-12-26 0001227654 2020-12-31 2020-12-31 0001227654 --12-31 false 8-K 2020-12-26 Compass Minerals International, Inc. DE 001-31921 36-3972986 9900 West 109th Street Suite 100 Overland Park KS 66210 913 344-9200 false false false false Common stock, $0.01 par value CMP NYSE false