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Revenue and Contracts with Customers Revenue and Contracts with Customers (Schedule of Accounts Receivable) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed accounts receivable | $ 24.9 | $ 13.2
Unbilled contract revenue | 6.3 | 7.9
Accounts receivable, net | $ 31.2 | $ 21.1

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