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Revenue Contract Balances (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Accounts receivable, net of allowance of $92.6 and $98.3, respectively $ 3,440.3 $ 4,646.4
Accounts receivable, billable to clients 1,842.7 1,820.7
Contract assets 43.1 51.8
Contract liabilities (deferred revenue) 689.1 $ 657.8
Revenue, Remaining Performance Obligation, Amount $ 643.0