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Segment Reporting - Total Segments to Partnership Income before Provision for Taxes Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Revenues $ 639.9 $ 607.3 $ 2,668.4 $ 1,698.4  
Expenses 492.6 661.8 2,007.5 1,668.1  
Other income 18.6 4.8 76.4 3.1  
Economic net income 165.9 (49.7) 737.3 33.4  
Total assets 11,686.6   11,686.6   $ 9,973.0
Total Reportable Segments          
Segment Reporting Information [Line Items]          
Revenues 547.5 539.5 2,407.7 1,523.1  
Expenses 344.8 486.0 1,504.8 1,222.8  
Other income 0.0 0.0 0.0 0.0  
Economic net income 202.7 53.5 902.9 300.3  
Total assets 7,394.6   7,394.6    
Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues 47.7 24.8 128.1 67.5  
Expenses 95.5 134.6 305.5 339.4  
Other income 0.0 0.0 0.0 0.0  
Economic net income (47.8) (109.8) (177.4) (271.9)  
Total assets (203.5)   (203.5)    
Consolidated Funds | Consolidated Funds          
Segment Reporting Information [Line Items]          
Revenues 44.7 43.0 132.6 107.8  
Expenses 52.3 41.2 197.2 105.9  
Other income 18.6 4.8 76.4 3.1  
Economic net income 11.0 $ 6.6 11.8 $ 5.0  
Total assets $ 4,495.5   $ 4,495.5   $ 4,684.7