Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 27.6	$ 59.8
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization of fixed assets and intangible assets	77.4	71.4
Provision for uncollectible receivables	7.4	9.1
Amortization of restricted stock and other non-cash compensation	24.9	29.4
Net amortization of bond discounts (premiums) and deferred financing costs	4.0	(0.7)
Deferred income tax benefit	(14.3)	(43.4)
Other	(11.5)	8.8
Changes in assets and liabilities, net of acquisitions and dispositions, providing (using) cash:
Accounts receivable	330.5	675.1
Expenditures billable to clients	(255.7)	(278.2)
Other current assets	(56.4)	(46.0)
Accounts payable	(573.4)	(622.2)
Accrued liabilities	(150.3)	(189.9)
Other non-current assets and liabilities	(1.6)	(13.8)
Net cash used in operating activities	(591.4)	(340.6)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions, including deferred payments, net of cash acquired	(48.2)	(51.6)
Capital expenditures	(46.8)	(58.2)
Net sales (purchases) and maturities of short-term marketable securities	11.6	(0.3)
Proceeds from sales of businesses and investments, net of cash sold	3.1	12.6
Other investing activities	(2.1)	(0.1)
Net cash used in investing activities	(82.4)	(97.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of long-term debt	(1.2)	(400.5)
Proceeds from issuance long-term debt	0	246.8
Repurchase of common stock	(180.6)	(118.1)
Common stock dividends	(62.7)	(52.3)
Exercise of stock options	31.5	7.7
Acquisition-related payments	(26.8)	(34.5)
Net increase in short-term bank borrowings	19.1	28.5
Distributions to noncontrolling interests	(7.0)	(9.0)
Preferred stock dividends	(5.8)	(5.8)
Excess tax benefit on share-based compensation	7.4	0
Other financing activities	0.1	(3.9)
Net cash used in financing activities	(226.0)	(341.1)
Effect of foreign exchange rate changes on cash and cash equivalents	(61.1)	(21.4)
Net decrease in cash and cash equivalents	(960.9)	(800.7)
Cash and cash equivalents at beginning of period	2,574.8	2,302.7
Cash and cash equivalents at end of period	$ 1,613.9	$ 1,502.0