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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, 2017
Dec. 31, 2016
Dec. 31, 2015
 [2]
Equity Method Investments and Joint Ventures [Abstract]      
Revenue(1) [1] $ 3,126.3 $ 2,200.9 [2] $ 2,217.1
Net income(1) [1] 2,182.7 1,068.9 [2] $ 431.5
Assets 3,324.9 1,915.3  
Liabilities and Non-controlling interests 1,405.5 $ 862.4  
Undistributed earnings from equity method affiliates $ 192.5    
[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.