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Related Party Transactions and Transactions with Grace (Details) - W.R. Grace & Co. - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Other assets    
Related Party Transaction [Line Items]    
Indemnified receivables, tax $ 3.8 $ 3.9
Other current liabilities    
Related Party Transaction [Line Items]    
Indemnified payables, tax $ 1.0 $ 1.8