Related Party Transactions - Due to Affiliates (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Related Party Transactions [Abstract]
Due to affiliates of Consolidated Funds	$ 0.2	$ 0.2
Due to non-consolidated affiliates (1)	39.4	29.7
Performance-based contingent cash consideration related to acquisitions	31.2	36.1
Amounts owed under the tax receivable agreement	147.5	137.8
Other	16.5	19.8
Total	$ 234.8	$ 223.6