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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |
Severance costs |  | $ 0.8 | $ 0.9 | $ 9.6 | $ 7.1 |
DuPont |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Supply agreement term | 5 years |  |  |  |  |
Revenues |  | $ 24.0 | $ 36.0 | 87.0 | $ 85.0 |
DuPont | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Expected remaining expense |  |  |  | 15.0 |  |
DuPont | Minimum | Forecast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Severance costs |  |  |  |  |  | $ 5.0
DuPont | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Expected remaining expense |  |  |  | $ 20.0 |  |
DuPont | Maximum | Forecast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Severance costs |  |  |  |  |  | $ 8.0

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