Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 113.6	$ 132.1
Adjustments to Reconcile Net Income to Cash Used in Operating Activities
Net amortization of bond discounts and deferred financing costs	0.3	0.7
Provision for uncollectible receivables	1.7	(0.1)
Deferred income tax	6.0	14.2
Net losses on sales of businesses	6.8	4.2
Amortization of restricted stock and other non-cash compensation	16.4	11.1
Depreciation and amortization	65.2	66.5
Other	8.9	9.2
Changes in assets and liabilities, net of acquisitions and divestitures, providing (using) cash:
Accounts receivable	1,369.4	1,539.1
Accounts receivable, billable to clients	(54.0)	110.0
Prepaid Expense	125.4	120.5
Other Current Assets	(38.7)	(11.9)
Accounts payable	(1,532.6)	(1,798.3)
Accrued liabilities	(174.4)	(227.9)
Contract liabilities	30.0	10.5
Other non-current assets and liabilities	(36.0)	(90.3)
Net cash used in operating activities	(157.4)	(547.6)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(35.1)	(32.9)
Net Proceeds from Divestiture of Businesses, Net of Cash Divested	16.4	(1.0)
Acquisitions, net of cash acquired	0.0	4.0
Other investing activities	1.5	1.2
Net cash used in investing activities	(50.0)	(34.7)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common stock dividends	(126.6)	(123.2)
Payments for Repurchase of Common Stock	(62.4)	(77.8)
Net decrease in short-term borrowings	(20.4)	(12.0)
Tax payments for employee shares withheld	(13.5)	(57.3)
Distributions to noncontrolling interests	(4.3)	(3.1)
Acquisition-related payments	0.0	(1.1)
Other financing activities	0.1	0.2
Net cash used in financing activities	(227.1)	(274.3)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(20.0)	(9.7)
Net decrease in cash, cash equivalents and restricted cash	(454.5)	(866.3)
Cash, cash equivalents, and restricted cash at beginning of period	2,395.1	2,553.1
Cash, cash equivalents, and restricted cash at end of period	$ 1,940.6	$ 1,686.8