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Goodwill - Additional Disclosures (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) reporting_unit | Sep. 30, 2017 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  | 2 |
Goodwill impairment recognized | $ 0 |  | $ 0 | $ 37,180,000 | $ 0
Energy Chemistry Technologies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment recognized |  | $ 37,200,000 |  | 37,180,000 |
Consumer and Industrial Chemistry Technologies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment recognized | $ 0 |  |  | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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