Intangible Assets (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Goodwill, gross carrying value	$ 8,974.2		$ 8,386.7
Goodwill, accumulated amortization	576.7		577.6
Goodwill, net carrying value	8,397.5	7,726.5
Other identifiable intangible assets subject to amortization, gross carrying value	836.3		633.0
Other identifiable intangible assets subject to amortization, accumulated amortization	400.3		354.8
Other identifiable intangible assets subject to amortization, net carrying value	436.0		278.2
Goodwill [Roll Forward]
Goodwill, beginning balance	7,809.1	7,641.2
Goodwill, acquisitions	640.8	168.5
Goodwill, dispositions	(10.0)	(3.8)
Goodwill, foreign currency translation	(42.4)	(79.4)
Goodwill, ending balance	8,397.5	7,726.5
Goodwill, impairment losses	0
Goodwill, accumulated impairment losses	0
Goodwill, acquisitions of noncontrolling interests	129.7
Purchased and internally developed software [Member]
Other identifiable intangible assets subject to amortization, gross carrying value	267.7		260.5
Other identifiable intangible assets subject to amortization, accumulated amortization	209.2		205.3
Other identifiable intangible assets subject to amortization, net carrying value	58.5		55.2
Customer related and other [Member]
Other identifiable intangible assets subject to amortization, gross carrying value	568.6		372.5
Other identifiable intangible assets subject to amortization, accumulated amortization	191.1		149.5
Other identifiable intangible assets subject to amortization, net carrying value	$ 377.5		$ 223.0