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Goodwill and Acquired Client Relationships
12 Months Ended
Dec. 31, 2017
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
 
 
2016
 
2017
Balance, as of January 1,
 
$
2,668.4

 
$
2,628.1

Foreign currency translation
 
(40.3
)
 
34.4

Balance, as of December 31,
 
$
2,628.1

 
$
2,662.5



As of September 30, 2017, the Company completed impairment assessments on its goodwill and no impairments were indicated. 
 
 
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, 2015
 
$
1,301.8

 
$
(680.4
)
 
$
621.4

 
$
1,065.0

 
$
1,686.4

Intangible amortization and impairments
 

 
(107.7
)
 
(107.7
)
 
(2.5
)
 
(110.2
)
Foreign currency translation
 
(11.8
)
 

 
(11.8
)
 
(67.0
)
 
(78.8
)
Balance, as of December 31, 2016
 
$
1,290.0

 
$
(788.1
)
 
$
501.9

 
$
995.5

 
$
1,497.4

Intangible amortization and impairments
 

 
(86.4
)
 
(86.4
)
 

 
(86.4
)
Foreign currency translation
 
5.5

 

 
5.5

 
33.2

 
38.7

Balance, as of December 31, 2017
 
$
1,295.5

 
$
(874.5
)
 
$
421.0

 
$
1,028.7

 
$
1,449.7


Definite-lived acquired client relationships are amortized over their expected period of economic benefit. The Company recorded amortization expense, in Intangible amortization and impairments, for these relationships of $115.4 million, $107.7 million and $86.4 million, respectively, for the years ended December 31, 2015, 2016 and 2017. Based on relationships existing as of December 31, 2017, the Company estimates that its consolidated annual amortization expense will be approximately $85 million in 2018 and 2019, $50 million in 2020 and $30 million in 2021 and 2022.
During 2017, the Company completed impairment assessments on its definite-lived and indefinite-lived acquired client relationships and no impairments were indicated.