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Segment Reporting - Total Segments to Partnership Income Before Provision for Taxes Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenues $ 1,581.8 $ 2,437.2  
Expenses 841.9 1,285.2  
Other income (loss) 2.8 12.3  
Distributable earnings 742.7 1,164.3  
Consolidated VIEs, assets 21,736.4   $ 21,250.4
Total Reportable Segments      
Segment Reporting Information [Line Items]      
Revenues 779.5 612.5  
Expenses 476.7 397.6  
Other income (loss) 0.0 0.0  
Distributable earnings 302.8 214.9  
Consolidated VIEs, assets 15,160.8    
Consolidated Funds      
Segment Reporting Information [Line Items]      
Revenues 61.7 61.1  
Expenses 52.9 56.5  
Other income (loss) 2.8 12.3  
Distributable earnings 11.6 16.9  
Consolidated VIEs, assets 6,723.9    
Reconciling Items      
Segment Reporting Information [Line Items]      
Revenues 740.6 1,763.6  
Expenses 312.3 831.1  
Other income (loss) 0.0 0.0  
Distributable earnings 428.3 $ 932.5  
Consolidated VIEs, assets $ (148.3)