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Revenue Contract Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Accounts receivable, net of allowance of $68.5 and $98.3, respectively | $ 5,177.7 | $ 4,646.4
Accounts receivable, billable to clients | 2,347.2 | 1,820.7
Contract with Customer, Asset, after Allowance for Credit Loss | 62.3 | 51.8
Contract liabilities | 688.5 | 657.8
Revenue, remaining performance obligation, amount | 605.1 |
Net revenue | $ 9,107.9 | $ 8,064.5

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