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Revenue Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
NET INCOME	$ 117.0	$ 278.5	$ (43.9)	$ 2.6	$ 342.2	$ 168.4	$ 172.8	$ (9.5)	$ 354.2	$ 673.9	$ 637.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization									290.6	278.5	202.9
Provision for uncollectible receivables									59.5	10.1	6.5
Amortization of restricted stock and other non-cash compensation									67.0	80.2	82.2
Net amortization of bond discounts and deferred financing costs									11.4	9.3	6.5
Deferred income tax provision									(46.4)	9.7	14.1
Net losses on sales of businesses	(15.2)	$ (8.6)	$ (19.9)	$ (23.3)	(23.9)	$ (7.7)	$ (3.2)	$ (8.6)	67.0	43.4	61.9
Other									20.0	6.8	1.2
Net Cash Provided by (Used in) Investing Activities [Abstract]
Accounts receivable									551.4	(111.2)	(603.8)
Accounts receivable, billable to clients									122.5	(38.7)	(209.5)
Other current assets									11.9	(27.2)	(67.2)
Accounts payable									(27.0)	546.0	428.7
Accrued liabilities									179.3	27.4	(24.2)
Contract liabilities									62.0	46.5	44.9
Other non-current assets and liabilities									(141.8)	(37.2)	(16.8)
Net cash provided by operating activities									1,847.2	1,529.2	565.1
Net cash used in investing activities									(216.2)	(161.7)	(2,491.5)
Net cash (used in) provided by financing activities									(346.2)	(843.0)	1,853.2
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash									31.0	(6.0)	(47.3)
Net increase (decrease) in cash, cash equivalents and restricted cash									1,315.8	518.5	(120.5)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 2,511.5				$ 1,195.7				$ 2,511.5	$ 1,195.7	$ 677.2	$ 797.7

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