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Related Party Transactions and Transactions with Grace	9 Months Ended
Related Party Transactions and Transactions with Grace	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions and Transactions with Grace	Related Party Transactions and Transactions with Grace All contracts with related parties are at rates and terms that GCP believes are comparable with those that could be entered into with independent third parties. Subsequent to the Separation, transactions with Grace represent third-party transactions. Tax Sharing Agreement Per the Tax Sharing Agreement, Grace is responsible for all U.S. federal, state and foreign income taxes including any related interest, penalties or audit adjustments reportable on a consolidated, combined or unitary return that includes Grace or any of its subsidiaries and GCP or any of its subsidiaries up to the Separation date. At September 30, 2021 and December 31, 2020, GCP has recorded $1.8 million of indemnified receivables in “Other assets” and $1.0 million of indemnified payables in “Other current liabilities” in the unaudited Condensed Consolidated Balance Sheets.