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Divestitures and Other Transactions - PChem Results of Operations (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Liability related to the settlement agreement $ 12.5 $ 12.5
Fayetteville Works facility    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate   20.0
Performance Chemicals | Accounts and Notes Receivable [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification Asset for liabilities indemnified by Chemours 64.0 64.0
Performance Chemicals | Other Assets [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification Asset for liabilities indemnified by Chemours 255.0 255.0
Performance Chemicals | Accrued and Other Current Liabilities [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnified Liabilities for liabilities indemnified by Chemours (24.0) (24.0)
Performance Chemicals | Other noncurrent obligations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnified Liabilities for liabilities indemnified by Chemours (75.0) (75.0)
Performance Chemicals    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income (loss) from discontinued operations before income taxes 34.0 $ 37.0
Settlement Agreement    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income (loss) from discontinued operations before income taxes $ 11.0