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Goodwill and Acquired Client Relationships (Tables)
6 Months Ended
Jun. 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 translation8.3 
Balance, as of June 30, 2021$2,669.7 
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— (16.4)(16.4)— (16.4)
Foreign currency translation3.9 (3.5)0.4 4.0 4.4 
Balance, as of June 30, 2021$1,170.5 $(1,046.7)$123.8 $913.0 $1,036.8