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Goodwill and Other Intangible Assets Changes in Carrying Value of Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018 are listed below.
 
 
 IAN 1
 
CMG
 
Total 2
Balance as of December 31, 2017
 
$
3,161.8

 
$
658.6

 
$
3,820.4

Acquisitions
 
1,112.0

 
20.0

 
1,132.0

Foreign currency and other
 
(64.5
)
 
(12.0
)
 
(76.5
)
Balance as of December 31, 2018
 
$
4,209.3

 
$
666.6

 
$
4,875.9

Acquisitions
 
2.1

 
0.7

 
2.8

Foreign currency and other
 
14.4

 
1.3

 
15.7

Balance as of December 31, 2019
 
$
4,225.8

 
$
668.6

 
$
4,894.4