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Investments - Schedule of Investment Components (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 05, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investment Components            
Investments at fair value   $ 332.2   $ 332.2   $ 321.4
Equity-accounted investments in Affiliates and consolidated Funds   49.4   49.4   1.9
Total investments per Condensed Consolidated Balance Sheets   381.6   381.6   323.3
Investments in unconsolidated Funds            
Investment Components            
Total investments per Condensed Consolidated Balance Sheets   206.1   206.1   198.5
Investment Income            
Investment income   2.1 $ (0.4) 9.1 $ 65.7  
Consolidated Funds            
Investment Components            
Investments at fair value   128.1   128.1   124.8
Total investments per Condensed Consolidated Balance Sheets   175.5   175.5   124.8
Investment Income            
Net consolidated Funds’ investment gains (losses)   (4.5) (3.3) 9.1 (5.7)  
Other investments held at fair value | Investments in unconsolidated Funds            
Investment Components            
Investments at fair value   104.3   104.3   104.8
Investment Income            
Investment income   1.4 (1.1) 7.8 (1.3)  
Other investments held at fair value | Consolidated Funds            
Investment Income            
Net consolidated Funds’ investment gains (losses)   0.1 (3.3) 3.0 (5.7)  
Investments related to long-term incentive compensation plans held at fair value | Investments in unconsolidated Funds            
Investment Components            
Investments at fair value   99.8   99.8   $ 91.8
Investment return of equity-accounted investments in Affiliates | Investments in unconsolidated Funds            
Investment Income            
Investment income   0.7 0.7 1.3 1.3  
Investment return of equity-accounted investments in Affiliates | Consolidated Funds            
Investment Income            
Net consolidated Funds’ investment gains (losses)   (4.6) 0.0 6.1 0.0  
Gain on sale of Affiliate carried at cost | Investments in unconsolidated Funds            
Investment Income            
Investment income $ 65.7 0.0 0.0 0.0 65.7  
Gain on sale of Affiliate carried at cost | Consolidated Funds            
Investment Income            
Net consolidated Funds’ investment gains (losses)   $ (4.5) $ (3.3) $ 9.1 $ (5.7)