Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 59.8	$ 55.7
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization of fixed assets and intangible assets	71.4	73.3
Provision for uncollectible receivables	9.1	5.7
Amortization of restricted stock and other non-cash compensation	29.4	29.5
Net amortization of bond premiums and deferred financing costs	(0.7)	(4.0)
Deferred income tax benefit	(43.4)	(36.1)
Other	8.8	13.7
Changes in assets and liabilities, net of acquisitions and dispositions, providing (using) cash:
Accounts receivable	675.1	251.0
Expenditures billable to clients	(278.2)	(107.7)
Other current assets	(46.0)	(30.7)
Accounts payable	(622.2)	(585.5)
Accrued liabilities	(189.9)	(195.8)
Other non-current assets and liabilities	(13.8)	(70.8)
Net cash used in operating activities	(340.6)	(601.7)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(58.2)	(53.1)
Acquisitions, including deferred payments, net of cash acquired	(51.6)	(38.6)
Proceeds from sales of businesses and investments, net of cash sold	12.6	7.0
Other investing activities	(0.4)	0.2
Net cash used in investing activities	(97.6)	(84.5)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of long-term debt	(400.5)	(1.5)
Proceeds from issuance of 4.00% Senior Notes due 2022	246.8	0
Repurchase of common stock	(118.1)	(139.0)
Common stock dividends	(52.3)	(56.8)
Acquisition related payments	(34.5)	(47.6)
Net increase in short term bank borrowings	28.5	24.7
Distributions to noncontrolling interests	(9.0)	(10.7)
Exercise of stock options	7.7	11.7
Preferred stock dividends	(5.8)	(5.8)
Other financing activities	(3.9)	4.3
Net cash used in financing activities	(341.1)	(220.7)
Effect of foreign exchange rate changes on cash and cash equivalents	(21.4)	41.0
Net decrease in cash and cash equivalents	(800.7)	(865.9)
Cash and cash equivalents at beginning of period	2,302.7	2,675.7
Cash and cash equivalents at end of period	$ 1,502.0	$ 1,809.8