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Related Parties (Details) - Affiliated Entity - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Related Party Transactions [Line Items]        
Total operating revenues $ 1,572.3 $ 1,294.8 $ 3,092.1 $ 2,760.3
Investment management fees        
Related Party Transactions [Line Items]        
Total operating revenues 1,128.3 932.1 2,218.3 1,988.0
Service and distribution fees        
Related Party Transactions [Line Items]        
Total operating revenues 379.6 316.7 745.9 665.9
Performance fees        
Related Party Transactions [Line Items]        
Total operating revenues 4.2 2.4 5.8 3.4
Other        
Related Party Transactions [Line Items]        
Total operating revenues $ 60.2 $ 43.6 $ 122.1 $ 103.0