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Subsequent Events - Additional Information (Details) - Subsequent Event [Member] - Plant Fire [Member] - Israeli Facility [Member]	Nov. 19, 2019 USD ($) Defendant
Subsequent Event [Line Items]
Description of damages sought under lawsuit	On November 19, 2019, Ashland received notice that it was named as one of seventeen defendants in a lawsuit seeking roughly $100 million in monetary damages related to a plant fire at an Israeli facility.
Name of defendant	Ashland
Number of defendants | Defendant	17
Damages sought, value	$ 100,000,000
Reserves established for lawsuit	$ 0

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