Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets [Abstract]
Cash and cash equivalents	$ 1,956.3	$ 1,781.2
Short-term investments, at cost	16.5	23.8
Accounts receivable, net of allowance for doubtful accounts of $37.8 and $40.6	6,260.2	6,632.0
Work in process	700.2	640.3
Other current assets	1,463.9	1,344.2
Total Current Assets	10,397.1	10,421.5
Property, Plant and Equipment, at cost, less accumulated depreciation of $1,235.4 and $1,186.1	700.0	682.9
Investments In Affiliates	192.5	184.2
Goodwill	8,728.6	8,456.3
Intangible Assets, net of accumulated amortization of $477.4 and $416.9	446.8	468.4
Other Assets	333.0	292.1
TOTAL ASSETS	20,798.0	20,505.4
Current Liabilities [Abstract]
Accounts payable	7,430.2	8,060.0
Customer advances	1,191.5	1,225.3
Current portion of debt	0.4	0.7
Short-term borrowings	11.1	9.5
Taxes payable	128.5	237.0
Other current liabilities	1,940.5	2,138.5
Total Current Liabilities	10,702.2	11,671.0
Long-Term Notes Payable	3,791.2	2,523.5
Convertible Debt	659.4	659.4
Long-Term Liabilities	653.4	602.0
Long-Term Deferred Tax Liabilities	948.4	867.6
Commitments and Contingent Liablities (See Note 11)
Temporary Equity - Redeemable Noncontrolling Interests	196.7	202.1
Shareholders' Equity [Abstract]
Preferred stock	0	0
Common stock	59.6	59.6
Additional paid-in capital	919.0	1,043.5
Retained earnings	8,168.1	7,724.1
Accumulated other comprehensive income (loss)	(120.7)	(191.7)
Treasury stock, at cost	(5,667.4)	(5,131.2)
Total Shareholders' Equity	3,358.6	3,504.3
Noncontrolling interests	488.1	475.5
Total Equity	3,846.7	3,979.8
TOTAL LIABILITIES AND EQUITY	$ 20,798.0	$ 20,505.4