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Noncontrolling Interests - Redeemable (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Redeemable Noncontrolling Interests        
Total redeemable noncontrolling interests $ 677.9 $ 677.9   $ 85.8
Roll forward of redeemable noncontrolling interests in consolidated seed investment products        
Opening balance 677.9      
Closing balance 85.8 677.9    
Seeded investment products        
Redeemable Noncontrolling Interests        
Total redeemable noncontrolling interests 662.8 121.6 $ 121.6 70.6
Roll forward of redeemable noncontrolling interests in consolidated seed investment products        
Opening balance 662.8 121.6 174.9  
Changes in market value 22.2 18.9 (15.5)  
Changes in ownership (612.2) 509.7 (36.3)  
Foreign currency translation (2.2) 12.6 (1.5)  
Closing balance 70.6 662.8 $ 121.6  
Intech Founders        
Redeemable Noncontrolling Interests        
Total redeemable noncontrolling interests 3.3 3.3   $ 2.9
Roll forward of redeemable noncontrolling interests in consolidated seed investment products        
Opening balance 3.3      
Closing balance 2.9 3.3    
Remaining interest (as a percent)       1.10%
Consolidated | Seeded investment products        
Redeemable Noncontrolling Interests        
Total redeemable noncontrolling interests 662.8 662.8   $ 70.6
Roll forward of redeemable noncontrolling interests in consolidated seed investment products        
Opening balance 662.8      
Closing balance 70.6 662.8    
Intech | Intech        
Redeemable Noncontrolling Interests        
INTECH appreciation rights $ 12.3 $ 11.8