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Revenue and Contracts with Customers Revenue and Contracts with Customers (Schedule of Accounts Receivable) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed accounts receivable $ 5.3 $ 23.1
Unbilled contract revenue 7.2 6.0
Accounts receivable, net $ 12.5 $ 29.1