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Divestitures and Assets Held for Sale - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 26, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on sale of Affiliate   $ 7.2   $ 7.2    
Seed investments held for sale   139.9   139.9   $ 0.0
Consolidated Entity Excluding Consolidated Funds            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on sale of Affiliate   7.2 $ 0.0 7.2 $ 0.0  
Assets held for sale   151.0   151.0   0.0
Liabilities held for sale   80.4   80.4   0.0
Seed investments held for sale   27.0   27.0   0.0
Consolidated Funds            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets held for sale   114.3   114.3   0.0
Liabilities held for sale   0.1   0.1   0.0
Seed investments held for sale   112.9   112.9   $ 0.0
Disposal Group, Held-for-sale, Not Discontinued Operations | Copper Rock | Consolidated Entity Excluding Consolidated Funds            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on sale of Affiliate   7.2   7.2    
Disposal Group, Held-for-sale, Not Discontinued Operations | Barrow Hanley | Consolidated Entity Excluding Consolidated Funds            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of interest in subsidiary $ 319.0          
Assets held for sale   151.0   151.0    
Liabilities held for sale   80.4   80.4    
Operating income (loss) held for sale   9.6 20.4 33.1 60.5  
Seed investments held for sale   27.0   27.0    
Disposal Group, Held-for-sale, Not Discontinued Operations | Barrow Hanley | Consolidated Entity Excluding Consolidated Funds | Seed Capital            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Seed investments held for sale   17.1   17.1    
Disposal Group, Held-for-sale, Not Discontinued Operations | Barrow Hanley | Consolidated Funds            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets held for sale   114.3   114.3    
Liabilities held for sale   0.1   0.1    
Operating income (loss) held for sale   4.7 $ 1.0 (2.0) $ 5.4  
Seed investments held for sale   $ 112.9   $ 112.9