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Revenue Contract Balances (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, net of allowance of $40.2 and $42.5, respectively | $ 5,209.2 | $ 5,126.6
Accounts receivable, billable to clients | 1,934.1 | 1,900.6
Contract with Customer, Asset, after Allowance for Credit Loss | 63.0 | 67.9
Contract liabilities | 585.6 | $ 533.9
Revenue, remaining performance obligation, amount | $ 704.0 |

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