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Income Taxes - Net Deferred Tax Assets (Liability) Held for Sale (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Components of Deferred Tax Assets and Liabilities [Abstract]  
Net deferred tax asset (liability), long-term assets held for sale $ 3.2
Net deferred tax asset (liability), long-term liabilities held for sale $ 6.5