Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Accounts receivable from related parties		$ 41.3	$ 40.3
Accounts payable and accrued liabilities to related parties		$ 15.2	$ 15.2
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares authorized	[1]	362,500,000	362,500,000
Common stock, shares issued	[1]	75,679,753	74,991,527
Common stock in treasury (in shares)	[1]	462,879	458,237
Non-voting shares
Common stock, shares authorized	[1]	29,000,000	29,000,000
Common stock, shares issued	[1]	21,146,136	21,146,136

[1] All share amounts have been adjusted to give effect to the 1-for-2.91 stock split in April 2016.