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Commitments and Contingencies - Narrative (Details) € in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 45 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 EUR (€) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) facility defendant | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Legal reserve adjustment during the period | $ (3,400) |  |  |  |  |  |
Gain related to litigation settlement |  |  | $ 0 | $ 0 | $ 82,858 | $ 0 |
Guarantee obligation carrying amount |  |  | 16,400 |  | $ 16,400 |  | $ 16,400
U.S. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of facilities owned | facility |  |  |  |  | 4 |  |
Settled with the U.S. government | Unfavorable Regulatory Action |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of carbon black producers (defendants) | defendant |  |  |  |  | 5 |  |
Period to install pollution control technology |  |  |  |  | 5 years |  |
Civil penalty |  |  |  |  | $ 800 |  |
Cost of environmental mitigation projects |  |  |  |  | 600 |  |
Settled with the U.S. government | Unfavorable Regulatory Action | U.S. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Capital expenditures for installments, payments |  |  |  |  |  |  | 181,000
Proceeds from legal settlements | $ 79,500 | € 66,550 |  |  |  |  |
Settled with the U.S. government | Unfavorable Regulatory Action | U.S. | Minimum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimated capital expenditures to be incurred for installments |  |  | 270,000 |  | 270,000 |  | 270,000
Settled with the U.S. government | Unfavorable Regulatory Action | U.S. | Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimated capital expenditures to be incurred for installments |  |  | $ 290,000 |  | $ 290,000 |  | $ 290,000

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