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Goodwill and Other Intangible Assets Changes in Carrying Value of Goodwill (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill
The changes in the carrying value of goodwill for our segments, IAN, CMG and Corporate & other, for the years ended December 31, 2018 and 2017 are listed below.
 
 
IAN
 
CMG
 
Corporate & other 1
 
Total 2
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

Acquisitions
 
1.2

 
20.0

 
1,110.8

 
1,132.0

Foreign currency and other
 
(63.3
)
 
(12.0
)
 
(1.2
)
 
(76.5
)
Balance as of December 31, 2018
 
$
3,099.7

 
$
666.6

 
$
1,109.6

 
$
4,875.9