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Goodwill and Acquired Client Relationships
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Client Relationships
Goodwill and Acquired Client Relationships
The following tables present the changes in the Company’s consolidated Affiliates’ Goodwill and components of Acquired client relationships (net):
 
 
Goodwill
 
 
Total
Balance, as of December 31, 2017
 
$
2,662.5

Foreign currency translation
 
4.8

Balance, as of March 31, 2018
 
$
2,667.3


 
Acquired Client Relationships (Net)
 
Definite-lived
 
Indefinite-lived
 
Total
 
Gross Book
Value
 
Accumulated
Amortization
 
Net Book
Value
 
Net Book
Value
 
Net Book
Value
Balance, as of December 31, 2017
$
1,295.5

 
$
(874.5
)
 
$
421.0

 
$
1,028.7

 
$
1,449.7

Intangible amortization and impairments

 
(23.2
)
 
(23.2
)
 

 
(23.2
)
Foreign currency translation
2.2

 

 
2.2

 
14.4

 
16.6

Balance, as of March 31, 2018
$
1,297.7

 
$
(897.7
)
 
$
400.0

 
$
1,043.1

 
$
1,443.1


Definite-lived acquired client relationships are amortized over their expected period of economic benefit. The Company recorded amortization expense within Intangible amortization and impairments, for these relationships of $21.9 million and $23.2 million for the three months ended March 31, 2017 and 2018, respectively. Based on relationships existing as of March 31, 2018, the Company estimates that its consolidated annual amortization expense will be approximately $90 million in each of 2018 and 2019, approximately $65 million in 2020 and approximately $40 million in each of 2021 and 2022.