Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue	$ 3,490.5	$ 3,406.6	$ 10,526.4	$ 10,274.8
Americas
Revenue	2,054.4	2,003.1	6,252.3	6,073.8
Long-lived assets and goodwill	6,072.4	6,088.5	6,072.4	6,088.5
EMEA
Revenue	1,050.8	1,007.2	3,138.5	3,072.8
Long-lived assets and goodwill	2,906.1	2,738.1	2,906.1	2,738.1
Asia Pacific
Revenue	385.3	396.3	1,135.6	1,128.2
Long-lived assets and goodwill	$ 592.1	$ 602.0	$ 592.1	$ 602.0

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration