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Related Party Transactions - Due from Affiliates and Other Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Notes receivable and accrued interest from affiliates $ 16.8 $ 37.6
Other receivables from unconsolidated funds and affiliates, net 248.6 184.0
Total 268.8 227.2
Contingent Obligations (Giveback)    
Related Party Transaction [Line Items]    
Unbilled receivable for giveback obligations from current and former employees $ 3.4 $ 5.6