Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 2.7	$ (4.2)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization of fixed assets and intangible assets	38.0	38.7
Provision for uncollectible receivables	3.2	2.7
Amortization of restricted stock and other non-cash compensation	23.1	16.8
Net amortization of bond discounts and deferred financing costs	1.4	1.4
Deferred income tax benefit	(28.1)	(31.8)
Losses on sales of businesses	16.3	0.1
Other	25.2	10.8
Changes in assets and liabilities, net of acquisitions and dispositions, providing (using) cash:
Accounts receivable	686.5	460.5
Expenditures billable to clients	(137.3)	(111.1)
Other current assets	(59.2)	(31.0)
Accounts payable	(981.1)	(929.9)
Accrued liabilities	(198.8)	(173.3)
Other non-current assets and liabilities	(41.0)	(30.4)
Net cash used in operating activities	(649.1)	(780.7)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(27.0)	(20.2)
Acquisitions, net of cash acquired	(27.0)	0.0
Other investing activities	(5.2)	0.2
Net cash used in investing activities	(59.2)	(20.0)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common stock dividends	(59.9)	(49.3)
Repurchase of common stock	(53.7)	(51.2)
Net (decrease) increase in short term bank borrowings	(24.6)	34.3
Tax payments for employee shares withheld	(19.5)	(16.2)
Distributions to noncontrolling interests	(4.0)	(1.2)
Exercise of stock options	3.9	9.1
Excess tax benefit on share-based compensation	0.0	8.5
Acquisition-related payments	0.0	(2.4)
Other financing activities	(0.1)	1.1
Net cash used in financing activities	(157.9)	(67.3)
Effect of foreign exchange rate changes on cash and cash equivalents	36.7	(58.3)
Net decrease in cash and cash equivalents	(829.5)	(926.3)
Cash and cash equivalents at beginning of period	1,502.9	1,660.6
Cash and cash equivalents at end of period	$ 673.4	$ 734.3