Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Significant Accounting Policies

Schedule of client commission arrangement

        Client commissions allocated for research and related prepaid and accrued research balances for the years ended December 31, 2015, 2014 and 2013 were as follows (dollars in millions):

	2015			2014		2013
Client commissions allocated for research	$	110.9		$	119.4	$	123.0
Prepaid research, gross	$	3.5		$	4.3	$	4.5
Allowance for prepaid research		(0.1	)		—		(0.2	)
Prepaid research, net of allowance	$	3.4		$	4.3	$	4.3
Accrued research payable	$	46.3		$	56.7	$	52.0