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ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Contract Balances |  |
Accounts receivable | $ 33.9 | $ 30.3
Unbilled fee revenue | 8.5 | 7.7
Unearned revenue | $ 3.1 | $ 1.4

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