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Revenue Contract Balances (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable, net of allowance of $90.2 and $98.3, respectively | $ 3,893.6 | $ 4,646.4
Accounts receivable, billable to clients | 2,043.4 | 1,820.7
Contract assets | 39.4 | 51.8
Contract liabilities (deferred revenue) | 678.5 | $ 657.8
Revenue, Remaining Performance Obligation, Amount | $ 640.6 |

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