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Goodwill and Acquired Client Relationships (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Goodwill
The following tables present the changes in the Company’s consolidated Affiliates’ Goodwill and components of Acquired client relationships (net):
Goodwill
Balance, as of December 31, 2020$2,661.4 
Foreign currency translation(2.9)
Balance, as of September 30, 2021$2,658.5 
As of September 30, 2021, the Company completed its annual impairment assessment on goodwill and no impairment was indicated.
Schedule of Changes in the Components of Acquired Client Relationships
 Acquired Client Relationships (Net)
 Definite-livedIndefinite-livedTotal
 Gross Book
Value
Accumulated
Amortization
Net Book
Value
Net Book
Value
Net Book
Value
Balance, as of December 31, 2020$1,166.6 $(1,026.8)$139.8 $909.0 $1,048.8 
Intangible amortization and impairments— (25.3)(25.3)— (25.3)
Foreign currency translation(0.2)0.1 (0.1)(5.2)(5.3)
Balance, as of September 30, 2021$1,166.4 $(1,052.0)$114.4 $903.8 $1,018.2