Related Party Transactions - Due to Affiliates (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Related Party Transactions [Abstract]
Due to affiliates of Consolidated Funds	$ 0.2	$ 0.3
Due to non-consolidated affiliates	29.7	51.7
Performance-based contingent cash and equity consideration related to acquisitions	36.1	35.3
Amounts owed under the tax receivable agreement	137.8	141.7
Other	19.8	16.9
Total	$ 223.6	$ 245.9