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Revenue and Contracts with Customers Accounts Receivable (Schedule of Accounts Receivable) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed Contracts Receivable $ 29.0 $ 23.1
Unbilled Receivables, Current 9.1 6.0
Accounts receivable, net $ 38.1 $ 29.1