Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 163.3	$ 131.7
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	144.1	90.0
Provision for uncollectible receivables	6.7	6.1
Amortization of restricted stock and other non-cash compensation	44.1	46.0
Net amortization of bond discounts and deferred financing costs	4.6	2.7
Deferred income tax provision	(3.0)	(31.0)
Net losses on sales of businesses	11.8	44.2
Other	2.1	1.9
Changes in assets and liabilities, net of acquisitions and divestitures, providing (using) cash:
Accounts receivable	743.3	238.0
Accounts receivable, billable to clients	(75.4)	(233.7)
Other current assets	(62.1)	(124.6)
Accounts payable	(676.9)	(579.3)
Accrued liabilities	(92.2)	(175.9)
Contract liabilities	50.2	38.0
Operating lease right-of-use assets	168.0	(0.0)
Operating lease liabilities	(164.0)	0.0
Other non-current assets and liabilities	(65.6)	(11.8)
Net cash provided by (used in) operating activities	199.0	(557.7)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(80.1)	(61.5)
Acquisitions, net of cash acquired	(0.6)	(8.5)
Other investing activities	2.8	12.4
Net cash used in investing activities	(77.9)	(57.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in short-term borrowings	132.3	669.3
Exercise of stock options	0.6	7.0
Repurchase of common stock	(0.0)	(114.5)
Common stock dividends	(181.4)	(161.2)
Repayment of long-term debt	(100.1)	(4.7)
Tax payments for employee shares withheld	(22.0)	(28.0)
Acquisition-related payments	(13.0)	(16.0)
Distributions to noncontrolling interests	(8.1)	(10.6)
Other financing activities	0.0	(0.3)
Net cash (used in) provided by financing activities	(191.7)	341.0
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash	10.3	(27.5)
Net decrease in cash, cash equivalents and restricted cash	(60.3)	(301.8)
Cash, cash equivalents, and restricted cash at beginning of period	677.2	797.7
Cash, cash equivalents, and restricted cash at end of period	$ 616.9	$ 495.9