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Fair Value Measurements - Level of Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets            
Derivative assets $ 6.3          
Liabilities            
Derivative liabilities 8.1          
Securities sold, not yet purchased 12.5   $ 26.5      
Total redeemable noncontrolling interests 468.7   677.9      
Seeded investment products            
Liabilities            
Total redeemable noncontrolling interests 453.7 $ 448.7 662.8 $ 138.8 $ 122.0 $ 121.6
Unconsolidated VIEs            
Assets            
Total investment securities 11.9   9.9      
Intech Founders            
Liabilities            
Total redeemable noncontrolling interests 2.8   3.3      
Consolidated | Seeded investment products            
Liabilities            
Total redeemable noncontrolling interests 453.7   662.8      
Consolidated VIEs            
Assets            
Total investment securities 632.2   924.8      
Fair value measurements, recurring            
Assets            
Cash equivalents 349.8   198.4      
Contingent consideration     2.9      
Total assets 1,228.5   1,380.3      
Liabilities            
Securities sold, not yet purchased 12.5   26.5      
Long-term debt 335.4   330.0      
Contingent consideration     21.2      
Total liabilities 402.0   463.9      
Fair value measurements, recurring | Deferred bonuses            
Liabilities            
Derivative liabilities 42.9          
Current portion of long-term debt     76.6      
Fair value measurements, recurring | Volantis            
Assets            
Contingent consideration 0.8          
Fair value measurements, recurring | Geneva            
Assets            
Contingent consideration 20.3          
Fair value measurements, recurring | Investment securities            
Assets            
Total investment securities 851.3   1,178.3      
Fair value measurements, recurring | Seed hedge derivatives            
Assets            
Derivative assets 6.3   0.7      
Liabilities            
Derivative liabilities 8.1   8.7      
Fair value measurements, recurring | Level 1            
Assets            
Cash equivalents 349.8   198.4      
Total assets 618.9   969.3      
Liabilities            
Securities sold, not yet purchased 12.5   26.5      
Total liabilities 12.5   26.5      
Fair value measurements, recurring | Level 1 | Investment securities            
Assets            
Total investment securities 269.1   770.9      
Fair value measurements, recurring | Level 2            
Assets            
Total assets 580.4   398.2      
Liabilities            
Long-term debt 335.4   330.0      
Total liabilities 346.6   339.6      
Fair value measurements, recurring | Level 2 | Investment securities            
Assets            
Total investment securities 574.1   397.5      
Fair value measurements, recurring | Level 2 | Seed hedge derivatives            
Assets            
Derivative assets 6.3   0.7      
Liabilities            
Derivative liabilities 8.1   8.7      
Fair value measurements, recurring | Level 3            
Assets            
Contingent consideration     2.9      
Total assets 29.2   12.8      
Liabilities            
Contingent consideration     21.2      
Total liabilities 42.9   97.8      
Fair value measurements, recurring | Level 3 | Deferred bonuses            
Liabilities            
Derivative liabilities 42.9          
Current portion of long-term debt     76.6      
Fair value measurements, recurring | Level 3 | Volantis            
Assets            
Contingent consideration 0.8          
Fair value measurements, recurring | Level 3 | Geneva            
Assets            
Contingent consideration 20.3          
Fair value measurements, recurring | Level 3 | Investment securities            
Assets            
Total investment securities 8.1   9.9      
Fair value measurements, recurring | Unconsolidated VIEs | Investment securities            
Assets            
Total investment securities 219.1   253.5      
Fair value measurements, recurring | Unconsolidated VIEs | Level 1 | Investment securities            
Assets            
Total investment securities 170.6   197.0      
Fair value measurements, recurring | Unconsolidated VIEs | Level 2 | Investment securities            
Assets            
Total investment securities 48.5   56.5      
Fair value measurements, recurring | Consolidated | Seeded investment products            
Liabilities            
Derivative liabilities 3.1   0.9      
Fair value measurements, recurring | Consolidated | Level 2 | Seeded investment products            
Liabilities            
Derivative liabilities 3.1   0.9      
Fair value measurements, recurring | Consolidated VIEs | Investment securities            
Assets            
Total investment securities 632.2   924.8      
Fair value measurements, recurring | Consolidated VIEs | Level 1 | Investment securities            
Assets            
Total investment securities 98.5   573.9      
Fair value measurements, recurring | Consolidated VIEs | Level 2 | Investment securities            
Assets            
Total investment securities 525.6   341.0      
Fair value measurements, recurring | Consolidated VIEs | Level 3 | Investment securities            
Assets            
Total investment securities $ 8.1   $ 9.9