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Revenue Contract Balances (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Accounts receivable, net of allowance of $46.8 and $48.6, respectively | $ 4,046.9 | $ 5,316.0
Accounts receivable, billable to clients | 2,417.4 | 2,023.0
Contract assets | 55.7 | 67.4
Contract liabilities (deferred revenue) | 688.4 | $ 680.0
Revenue, Remaining Performance Obligation, Amount | $ 780.4 |

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