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Revenue Contract Balances (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable, net of allowance of $38.8 and $42.5, respectively | $ 4,047.8 | $ 5,126.6
Accounts receivable, billable to clients | 2,018.7 | 1,900.6
Contract assets | 57.8 | 67.9
Contract liabilities (deferred revenue) | 562.4 | $ 533.9
Revenue, Remaining Performance Obligation, Amount | $ 759.0 |

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