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Acquisitions (Details 1) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Unaudited pro forma information that gives effect to all prior acquisitions
Revenues	$ 1,399.7	$ 1,287.2	$ 4,124.4	$ 3,946.2
Income from continuing operations	$ 160.7	$ 144.5	$ 481.7	$ 310.0
Diluted earnings per share from continuing operations	$ 0.98	$ 0.87	$ 2.89	$ 1.84

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

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