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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
installment
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
numberOfPromissoryNotes
Sep. 30, 2016
USD ($)
Related party transactions                  
Increase (decrease) in DTA Deed as a result of the Tax Act           $ (51.8)      
Number of promissory notes | numberOfPromissoryNotes               2  
Loan to related party       $ 8.4 $ 16.1        
Investments assigned to former parent, liability       3.4 3.7        
Earnings from equity method investees       35.1 16.7 0.0      
Loan to Equity-Method Affiliate                  
Related party transactions                  
Loan to related party             $ 4.5    
Consolidated Entity Excluding Consolidated Funds                  
Related party transactions                  
Revaluation gain (loss) of DTA Deed settlement       0.0 0.0 20.0      
Earnings from equity method investees       2.9 2.8 2.7      
Parent Company                  
Related party transactions                  
Original deferred tax asset deed payment value   $ 142.6              
Number of installment payments | installment   3              
Total estimated payment of future realizable benefits $ 45.5   $ 32.7            
Seed Investment Capital               $ 63.4 $ 39.6
Affiliated Entity And Joint Ventures Of Affiliated Entity                  
Related party transactions                  
Earnings from equity method investees       $ 2.9 $ 2.8 $ 2.7