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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 |

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