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Acquisitions - Narrative (Details) - DuPont - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 01, 2017
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Amount to be paid for assets acquired $ 1,225.6    
Supply agreement term     5 years
Revenues   $ 27.0