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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