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Intangible Assets Changes in Carrying Value of Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill
The changes in the carrying value of goodwill for our segments, IAN and CMG, for the years ended December 31, 2016 and 2015 are listed below.
 
 
IAN
 
CMG
 
Total 1
Balance as of December 31, 2014
 
$
3,108.5

 
$
560.7

 
$
3,669.2

Current-year acquisitions
 
37.8

 
13.2

 
51.0

Foreign currency and other
 
(94.9
)
 
(16.8
)
 
(111.7
)
Balance as of December 31, 2015
 
$
3,051.4

 
$
557.1

 
$
3,608.5

Current-year acquisitions
 
32.7

 
89.3

 
122.0

Foreign currency and other
 
(40.3
)
 
(15.8
)
 
(56.1
)
Balance as of December 31, 2016
 
$
3,043.8

 
$
630.6

 
$
3,674.4

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