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Redeemable Non-Controlling Interests (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Redeemable Noncontrolling Interest [Roll Forward]    
Balance, beginning balance [1] $ 916.7  
Changes attributable to consolidated Affiliate sponsored investment products (3.0)  
Transfers to Other liabilities (194.0)  
Transfers from Non-controlling interests 5.1 $ 47.3
Changes in redemption value (143.0)  
Balance, ending balance [1] $ 581.8  
Minimum    
Noncontrolling Interest [Line Items]    
Term of conditional right to put interest 5 years  
Maximum    
Noncontrolling Interest [Line Items]    
Term of conditional right to put interest 15 years  
Variable Interest Entity, Primary Beneficiary    
Redeemable Noncontrolling Interest [Roll Forward]    
Balance, beginning balance $ 21.6  
Balance, ending balance $ 18.6  
[1]
As of December 31, 2019 and March 31, 2020, Redeemable non-controlling interests includes consolidated Affiliate sponsored investment products primarily attributable to third-party investors of $21.6 million and $18.6 million, respectively.