Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue	$ 3,561.0	$ 3,487.4	$ 6,868.2	$ 6,638.8
Americas [Member]
Revenue	2,111.4	2,011.8	4,070.7	3,881.8
Long-lived assets and goodwill	6,053.2	5,984.5	6,053.2	5,984.5
EMEA [Member]
Revenue	1,071.0	1,144.2	2,065.6	2,150.8
Long-lived assets and goodwill	2,665.3	2,707.5	2,665.3	2,707.5
Asia/Australia [Member]
Revenue	378.6	331.4	731.9	606.2
Long-lived assets and goodwill	$ 579.3	$ 473.8	$ 579.3	$ 473.8