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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2017 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Severance costs |  | $ 6.1 |  | $ 3.2 | $ 9.6 | $ 8.8 |
DuPont |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Supply agreement term | 5 years |  |  |  |  |  |
Revenues |  | $ 26.0 |  | $ 32.0 | $ 51.0 | $ 63.0 |
DuPont | Minimum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  | $ 3.0
DuPont | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Severance costs |  |  | $ 2.0 |  |  |  |

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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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