Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 331.7	$ 295.2
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	213.1	134.0
Provision for uncollectible receivables	7.7	9.4
Amortization of restricted stock and other non-cash compensation	58.3	59.7
Net amortization of bond discounts and deferred financing costs	7.0	4.2
Deferred income tax provision	(1.5)	(22.9)
Net losses on sales of businesses	19.5	50.0
Other	1.5	4.2
Changes in assets and liabilities, net of acquisitions and divestitures, providing (using) cash:
Accounts receivable	1,010.2	443.6
Accounts receivable, billable to clients	(152.0)	(303.0)
Other current assets	(29.5)	(100.6)
Accounts payable	(952.7)	(766.9)
Accrued liabilities	(73.5)	(186.5)
Contract liabilities	37.2	46.1
Change in operating lease right-of-use asset and lease liabilities	2.8	(0.0)
Other non-current assets and liabilities	(56.2)	6.8
Net cash provided by (used in) operating activities	423.6	(326.7)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(133.8)	(105.7)
Acquisitions, net of cash acquired	(0.6)	(12.0)
Other investing activities	13.7	1.1
Net cash used in investing activities	(120.7)	(116.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in short-term borrowings	173.1	(4.6)
Exercise of stock options	4.2	9.1
Proceeds from Issuance of Long-term Debt	0.0	1,994.2
Repurchase of common stock	(0.0)	(117.1)
Repayment of long-term debt	(300.2)	(4.9)
Common stock dividends	(272.2)	(241.6)
Tax payments for employee shares withheld	(22.3)	(28.8)
Acquisition-related payments	(15.3)	(30.4)
Distributions to noncontrolling interests	(12.4)	(13.4)
Other financing activities	0.1	(11.9)
Net cash (used in) provided by financing activities	(445.0)	1,550.6
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	(11.1)	(35.3)
Net decrease in cash, cash equivalents and restricted cash	(153.2)	1,072.0
Cash, cash equivalents, and restricted cash at beginning of period	677.2	797.7
Cash, cash equivalents, and restricted cash at end of period	$ 524.0	$ 1,869.7