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Revenue Contract Balances (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Accounts receivable, net of allowance of $43.8 and $46.4, respectively | $ 4,505.9 | $ 5,768.8
Accounts receivable, billable to clients | 2,163.9 | 2,229.2
Contract assets | 45.4 | 68.6
Contract liabilities (deferred revenue) | 609.4 | $ 684.7
Revenue, Remaining Performance Obligation, Amount | $ 651.7 |

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