Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Goodwill, Gross Carrying Value			$ 9,219.2	$ 9,377.6
Goodwill, Accumulated Amortization			(536.5)	(555.4)
Goodwill, Net Carrying Value	$ 8,822.2	$ 8,916.0	8,682.7	8,822.2
Intangible assets:, Gross Carrying Value			1,001.0	1,000.8
Intangible assets:, Accumulated Amortization			(662.1)	(611.4)
Intangible assets:, Net Carrying Value			338.9	389.4
Goodwill [Roll Forward]
Goodwill, January 1	8,822.2	8,916.0
Goodwill, Acquisitions	88.3	131.4
Goodwill, Dispositions	(2.9)	(1.6)
Goodwill, Foreign currency translation	(224.8)	(170.6)
Goodwill, September 30	8,682.7	8,875.2
Goodwill, impairment losses	0.0
Goodwill, accumulated impairment losses			0.0
Goodwill, acquisitions of noncontrolling interests	$ 4.5	$ 27.6
Purchased and internally developed software
Intangible assets:, Gross Carrying Value			309.2	298.7
Intangible assets:, Accumulated Amortization			(238.1)	(221.4)
Intangible assets:, Net Carrying Value			71.1	77.3
Customer related and other
Intangible assets:, Gross Carrying Value			691.8	702.1
Intangible assets:, Accumulated Amortization			(424.0)	(390.0)
Intangible assets:, Net Carrying Value			$ 267.8	$ 312.1