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Revenue Contract Balances (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Accounts receivable, net of allowance of $90.2 and $98.3, respectively $ 3,893.6 $ 4,646.4
Accounts receivable, billable to clients 2,043.4 1,820.7
Contract assets 39.4 51.8
Contract liabilities (deferred revenue) 678.5 $ 657.8
Revenue, Remaining Performance Obligation, Amount $ 640.6