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Goodwill and Other Intangible Assets (Notes)
 12 Months Ended
Dec. 31, 2019
Goodwill and intangible assets [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]   Goodwill and Other Intangible Assets
Goodwill
Goodwill is the excess purchase price remaining from an acquisition after an allocation of purchase price has been made to identifiable assets acquired and liabilities assumed based on estimated fair values. 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

 
1
During 2018, the increase in goodwill is primarily due to the acquisition of Acxiom. See Note 6 for further information on the Acxiom acquisition.
2
For all periods presented, no goodwill impairment charge has been recorded.
See Note 1 for information regarding our annual impairment methodology.

Other Intangible Assets
Other intangible assets primarily consist of customer lists and know-how and technology, which have definite lives and are subject to amortization on a straight-line basis with estimated useful lives generally between 7 and 15 years, as well as trade names which have both indefinite and definite lives which are subject to amortization on a straight-line basis with estimated useful lives of 15 years. Amortization expense for other intangible assets for the years ended December 31, 2019, 2018 and 2017 was $86.0, $37.6 and $21.1, respectively. There were no material impairment charges on other intangibles for the years ended December 31, 2019, 2018 and 2017. During 2019 and 2018, we recorded approximately $5.0 and $999.0 of other intangible assets related to our acquisitions in the respective year. The increase in 2018 is primarily due to the acquisition of Acxiom.
The following table provides a summary of other intangible assets, which are included in our Consolidated Balance Sheets.
 
 
December 31,
 
 
2019
 
2018
 
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
 
Gross Amount
 
Accumulated
Amortization
 
Net Amount
Customer lists
 
$
861.4

 
$
(244.6
)
 
$
616.8

 
$
857.2

 
$
(190.9
)
 
$
666.3

Know-how and technology
 
235.0

 
(32.9
)
 
202.1

 
235.0

 
(6.5
)
 
228.5

Trade names
 
226.2

 
(41.3
)
 
184.9

 
226.2

 
(36.8
)
 
189.4

Other
 
14.3

 
(3.8
)
 
10.5

 
14.3

 
(3.8
)
 
10.5

Total
 
$
1,336.9

 
$
(322.6
)
 
$
1,014.3

 
$
1,332.7

 
$
(238.0
)
 
$
1,094.7



The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2019 is listed below.
 
 
2020
 
2021
 
2022
 
2023
 
2024
Estimated amortization expense
 
$
88.4

 
$
86.9

 
$
82.9

 
$
78.6

 
$
76.8