Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill, Gross Carrying Value	$ 9,573.8		$ 9,502.6
Goodwill, Accumulated Amortization	587.1		586.6
Goodwill, Net Carrying Value	8,986.7	8,713.9
Intangible assets:, Gross Carrying Value	962.2		938.3
Intangible assets:, Accumulated Amortization	577.5		552.3
Intangible assets:, Net Carrying Value	384.7		386.0
Goodwill [Roll Forward]
Goodwill, Balance January 1	8,916.0
Goodwill, Acquisitions	51.4	1.5
Goodwill, Dispositions	(1.2)	(0.6)
Goodwill, Foreign currency translation	20.5	(131.2)
Goodwill, Balance March 31	8,986.7	8,713.9
Goodwill, impairment losses	0
Goodwill, accumulated impairment losses	0
Goodwill, acquisitions of noncontrolling interests	10.9	0.7
Purchased and internally developed software
Intangible assets:, Gross Carrying Value	290.9		283.2
Intangible assets:, Accumulated Amortization	224.8		217.4
Intangible assets:, Net Carrying Value	66.1		65.8
Customer related and other
Intangible assets:, Gross Carrying Value	671.3		655.1
Intangible assets:, Accumulated Amortization	352.7		334.9
Intangible assets:, Net Carrying Value	$ 318.6		$ 320.2