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Equity Method Investments in Affiliates - Financial Information for Affiliates Accounted for Under the Equity Method (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [2]
Equity Method Investments and Joint Ventures [Abstract]      
Revenue [1] $ 3,231.7 $ 3,126.3 $ 2,200.9
Net income [1] 1,286.1 2,182.7 $ 1,068.9
Assets 2,730.4 3,324.9  
Liabilities and Non-controlling interests $ 1,235.1 $ 1,405.5  
[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.