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Revenue and Contracts with Customers Revenue and Contracts with Customers (Schedule of Accounts Receivable) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]    
Billed accounts receivable $ 20.6 $ 23.1
Unbilled contract revenue 3.4 6.0
Accounts receivable, net $ 24.0 $ 29.1