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Revenue - Receivables (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 354.9 | $ 288.3
Unbilled receivables | 10.9 | 14.8
Billed receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 344.0 | $ 273.5

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