Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 132.1	$ 160.9
Adjustments to Reconcile Net Income to Cash Used in Operating Activities
Provision for uncollectible receivables	(0.1)	(0.4)
Net amortization of bond discounts and deferred financing costs	0.7	0.7
Net losses on sales of businesses	4.2	6.4
Amortization of restricted stock and other non-cash compensation	11.1	12.5
Deferred income tax	14.2	14.1
Depreciation and amortization	66.5	67.8
Other	9.2	12.7
Changes in assets and liabilities, net of acquisitions and divestitures, providing (using) cash:
Accounts receivable	1,539.1	978.0
Accounts receivable, billable to clients	110.0	(184.7)
Other current assets	(108.6)	(82.1)
Accounts payable	(1,798.3)	(1,685.9)
Accrued liabilities	(227.9)	(334.5)
Contract liabilities	10.5	74.4
Other non-current assets and liabilities	(90.3)	(42.9)
Net cash used in operating activities	(547.6)	(633.6)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(32.9)	(30.7)
Acquisitions, net of cash acquired	4.0	0.0
Net proceeds from investments	0.0	(2.6)
Other investing activities	2.2	(0.7)
Net cash used in investing activities	(34.7)	(28.8)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common stock dividends	(123.2)	(118.3)
Repurchases of Common Stock	(77.8)	(63.1)
Tax payments for employee shares withheld	(57.3)	(38.3)
Net decrease in short-term borrowings	(12.0)	13.9
Distributions to noncontrolling interests	(3.1)	(3.1)
Acquisition-related payments	(1.1)	(1.1)
Other financing activities	0.2	(0.1)
Net cash used in financing activities	(274.3)	(210.1)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(9.7)	5.0
Net decrease in cash, cash equivalents and restricted cash	(866.3)	(867.5)
Cash, cash equivalents, and restricted cash at beginning of period	2,553.1	3,272.2
Cash, cash equivalents, and restricted cash at end of period	$ 1,686.8	$ 2,404.7