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Revenue Contract Balances (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts receivable, net of allowance of $58.8 and $68.5, respectively | $ 4,014.9 | $ 5,177.7
Accounts receivable, billable to clients | 2,233.0 | 2,347.2
Contract assets | 47.5 | 62.3
Contract liabilities (deferred revenue) | 664.4 | $ 688.5
Revenue, Remaining Performance Obligation, Amount | $ 565.9 |

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