XML 101 R78.htm IDEA: XBRL DOCUMENT v3.8.0.1
Equity Method Investments in Affiliates - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Fair value assumptions, average projected growth rate 10.00%    
Fair value assumptions, discount rate for asset based fees 14.00%    
Fair value assumptions, discount rate for performance based fees 25.00%    
Fair value assumptions, market participant tax rate 25.00%    
Impairment of equity method investment $ 93,100,000    
Equity method and cost method impairments   $ 0  
Revenue of equity method investment affiliate investment [1] 3,126,300,000 2,200,900,000 [2] $ 2,217,100,000 [2]
Net income of equity method affiliate investment [1] 2,182,700,000 1,068,900,000 [2] 431,500,000 [2]
Acquired Client Relationships (Net)      
Schedule of Equity Method Investments [Line Items]      
Intangible amortization expense 86,400,000 107,700,000 115,400,000
Intangible future amortization expense in 2018 85,000,000    
Intangible future amortization expense in 2019 85,000,000    
Intangible future amortization expense in 2020 50,000,000    
Intangible future amortization expense in 2021 30,000,000    
Intangible future amortization expense in 2022 30,000,000    
Acquired Client Relationships Under Equity Method Investments      
Schedule of Equity Method Investments [Line Items]      
Intangible amortization expense 106,100,000 59,200,000 $ 34,300,000
Intangible future amortization expense in 2018 120,000,000    
Intangible future amortization expense in 2019 120,000,000    
Intangible future amortization expense in 2020 120,000,000    
Intangible future amortization expense in 2021 120,000,000    
Intangible future amortization expense in 2022 120,000,000    
Equity Method Investee      
Schedule of Equity Method Investments [Line Items]      
Revenue of equity method investment affiliate investment 1,317,800,000 944,100,000  
Net income of equity method affiliate investment 806,600,000 529,000,000  
2016 New Seven Equity Method Investments | Equity Method Investee | Acquired Client Relationships (Net)      
Schedule of Equity Method Investments [Line Items]      
Intangible amortization expense $ 58,000,000 $ 17,000,000  
[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.