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Fixed Assets - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Depreciation and amortization $ 22.1    
Consolidated Entity Excluding Consolidated Funds      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization 22.1 $ 19.8 $ 16.2
Fixed asset disposals 13.6    
Accumulated depreciation (13.6)    
Consolidated Entity Excluding Consolidated Funds | Campbell Global      
Property, Plant and Equipment [Line Items]      
Fixed asset disposals 8.1    
Accumulated depreciation $ (2.6)