Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 162.9	$ 119.6
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization of fixed assets and intangible assets	77.8	78.2
Provision for uncollectible receivables	7.6	6.7
Amortization of restricted stock and other non-cash compensation	39.9	33.2
Net amortization of bond discounts and deferred financing costs	2.8	2.8
Deferred income tax (benefit) provision	(4.2)	0.2
Losses on sales of businesses	20.0	0.3
Other	28.0	11.5
Changes in assets and liabilities, net of acquisitions and dispositions, providing (using) cash:
Accounts receivable	428.2	284.1
Expenditures billable to clients	(110.8)	(53.2)
Other current assets	(33.2)	(17.7)
Accounts payable	(850.5)	(758.8)
Accrued liabilities	(251.8)	(198.3)
Other non-current assets and liabilities	(71.3)	(28.7)
Net cash used in operating activities	(554.6)	(520.1)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(63.0)	(49.8)
Acquisitions, net of cash acquired	(34.3)	0.0
Other investing activities	(5.7)	(0.1)
Net cash used in investing activities	(103.0)	(49.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common stock dividends	(120.1)	(98.5)
Repurchase of common stock	(112.5)	(102.0)
Acquisition-related payments	(29.2)	(27.8)
Tax payments for employee shares withheld	(22.5)	(16.5)
Distributions to noncontrolling interests	(7.2)	(8.2)
Net increase in short term bank borrowings	56.6	54.9
Exercise of stock options	9.8	10.6
Excess tax benefit on share-based compensation	0.0	9.0
Other financing activities	(0.2)	1.5
Net cash used in financing activities	(225.3)	(177.0)
Effect of foreign exchange rate changes on cash and cash equivalents	52.6	(64.7)
Net decrease in cash and cash equivalents	(830.3)	(811.7)
Cash and cash equivalents at beginning of period	1,502.9	1,660.6
Cash and cash equivalents at end of period	$ 672.6	$ 848.9