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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue Recognition [Line Items]          
Impairment losses $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Contract assets 0.0   0.0   $ 0.0
Revenue performance obligation 8.7   8.7    
Baxter Healthcare Organization          
Revenue Recognition [Line Items]          
Revenue performance obligation 5.7   5.7    
Concentrate Products          
Revenue Recognition [Line Items]          
Reserve for returns $ 0.0   $ 0.0   $ 0.0