Change in business (Details) (USD $) In Millions, except Per Share data	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009
Summary of combined results of operations
Total revenues	$ 44,973.2	$ 39,143.2
Net income from continuing operations	1,204.6	1,062.9
Basic earnings per share from continuing operations	$ 2.24	$ 1.94
Diluted earnings per share from continuing operations	$ 2.21	$ 1.92
Purchase price allocation
Current assets	943.8
Property and equipment	42.7
Acquired intangible assets	1,585.0
Goodwill	2,668.9
Liabilities assumed	(573.7)
Total	$ 4,666.7

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period

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