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Revenue and Contracts with Customers Revenue and Contracts with Customers (Schedule of Accounts Receivable) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed accounts receivable $ 7.5 $ 13.2
Unbilled contract revenue 10.0 7.9
Accounts receivable, net $ 17.5 $ 21.1