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Revenue Contract Balances (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Accounts receivable, net of allowance of $98.3 and $40.2, respectively | $ 4,646.4 | $ 5,209.2 | $ 4,646.4 | $ 5,209.2
Accounts receivable, billable to clients | 1,820.7 | 1,934.1 | 1,820.7 | 1,934.1
Contract with Customer, Asset, after Allowance for Credit Loss | 51.8 | 63.0 | 51.8 | 63.0
Contract liabilities | 657.8 | 585.6 | 657.8 | 585.6
Revenue, remaining performance obligation, amount | 654.0 |  | 654.0 |
Net revenue | $ 2,284.4 | $ 2,433.0 | $ 8,064.5 | $ 8,625.1

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