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Acquisitions - Narrative (Details) - DuPont - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 01, 2017
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Amount to be paid for assets acquired $ 1,225.6      
Supply agreement term       5 years
Revenues   $ 22.0 $ 49.0