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Intangible Assets Changes in Carrying Value of Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 are listed below.
 
 
IAN
 
CMG
 
Total 1
Balance as of December 31, 2015
 
$
3,051.4

 
$
557.1

 
$
3,608.5

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

Acquisitions
 
39.6

 
15.5

 
55.1

Foreign currency and other
 
78.4

 
12.5

 
90.9

Balance as of December 31, 2017
 
$
3,161.8

 
$
658.6

 
$
3,820.4

 
1
For all periods presented, no goodwill impairment charge has been recorded.