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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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