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Income Taxes (Deferred Tax Assets for Certain Tax Credits) (Details)
$ in Millions
Sep. 30, 2021
USD ($)
U.S. State  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 2.2
U.S. Federal  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards 2.1
Foreign  
Tax Credit Carryforward [Line Items]  
Tax credit carryforwards $ 27.5