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Equity Method Investments in Affiliates - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Fair value assumptions, average projected growth rate   2.50% 10.00%  
Fair value assumptions, discount rate for asset based fees   11.00% 14.00%  
Fair value assumptions, discount rate for performance based fees   20.00% 25.00%  
Fair value assumptions, market participant tax rate   25.00% 25.00%  
Impairment of equity method investment   $ 240,000,000 $ 93,100,000  
Equity method investments in Affiliates (net)   2,791,000,000 3,304,700,000  
Equity method and cost method impairments   0    
Undistributed earnings from equity method affiliates   92,400,000    
Revenue of equity method investment affiliate investment [1]   3,231,700,000 3,126,300,000 $ 2,200,900,000 [2]
Net income of equity method affiliate investment [1]   1,286,100,000 2,182,700,000 1,068,900,000 [2]
Equity Method Investee        
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Equity method investments in Affiliates (net)   2,791,000,000 3,304,700,000 3,368,300,000
Revenue of equity method investment affiliate investment   1,137,500,000 1,317,800,000  
Net income of equity method affiliate investment   524,500,000 806,600,000  
Equity Method Investee | Investment One        
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Impairment of equity method investment $ 33,300,000      
Equity method investments in Affiliates (net) $ 0 0    
Acquired Client Relationships Under Equity Method Investments        
Schedule of Equity Method Investments [Line Items]        
Intangible amortization expense   97,500,000 $ 106,100,000 $ 59,200,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Intangible future amortization expense in 2019   95,000,000    
Intangible future amortization expense in 2020   95,000,000    
Intangible future amortization expense in 2021   95,000,000    
Intangible future amortization expense in 2022   75,000,000    
Intangible future amortization expense in 2023   $ 75,000,000    
[1] Revenue and the associated net income include asset and performance based fees and the impact of consolidated investment products.
[2] Revenue and net income reflect investments in new Affiliates for the full-year, regardless of the date of the Company’s investment.