Intangible Assets Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying value of goodwill for our segments, IAN and CMG, for the years ended December 31,2012 and 2011 are listed below.

	IAN			CMG		Total 1
Balance as of December 31, 2010	$	2,906.0		$	462.5	$	3,368.5
Current year acquisitions	68.5			28.4		96.9
Contingent and deferred payments for prior acquisitions	0.8			0.0		0.8
Other 2	(22.4		)	0.5		(21.9		)
Balance as of December 31, 2011	$	2,952.9		$	491.4	$	3,444.3
Current year acquisitions	122.0			11.7		133.7
Contingent and deferred payments for prior acquisitions	2.2			0.0		2.2
Other 2	(2.5		)	2.9		0.4
Balance as of December 31, 2012	$	3,074.6		$	506.0	$	3,580.6

¹  For all periods presented we have not recorded a goodwill impairment charge.

²  Primarily includes foreign currency translation adjustments.

Schedule of Finite-Lived Intangible Assets by Major Class

The following table provides a summary of other intangible assets, which are included in other assets on our Consolidated Balance Sheets.

	December 31,
	2012							2011
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Customer lists	$	184.0	$	(96.9	)	$	87.1	$	165.9	$	(81.7	)	$	84.2
Trade names	59.7		(15.5		)	44.2		52.9		(12.3		)	40.6
Other	15.1		(5.7		)	9.4		17.3		(7.8		)	9.5
Total	$	258.8	$	(118.1	)	$	140.7	$	236.1	$	(101.8	)	$	134.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2012 is listed below.

	2013		2014		2015		2016		2017
Estimated amortization expense	$	29.9	$	29.8	$	26.1	$	15.2	$	5.5