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Segment Information Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Segments:
Assets	$ 13,493.9	$ 12,908.7
IAN
Segments:
Assets	11,035.3	10,589.2
CMG
Segments:
Assets	1,073.1	1,019.9
Corporate and other
Segments:
Assets	$ 1,385.5	$ 1,299.6

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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