Segment Information Balance Sheet (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Segments:
Assets	$ 12,301.6	$ 13,070.8
IAN
Segments:
Assets	10,353.1	10,481.7
CMG
Segments:
Assets	942.1	930.5
Corporate and Other
Segments:
Assets	$ 1,006.4	$ 1,658.6