Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUE
Fee and other revenue	$ 1,197.2	$ 1,230.4	$ 1,398.1
Investment revenue	20.0	54.7	49.5
Total revenue	1,217.2	1,285.1	1,447.6
EXPENSES
Fee and other commissions expense	603.6	613.4	688.6
Investment commissions expense	3.6	23.3	19.3
Direct transaction expense	45.8	25.5	24.3
Total commissions and direct transaction expenses	653.0	662.2	732.2
Compensation and benefits	223.8	228.4	259.8
Transaction and operations support (1)	111.6	207.8	298.8
Occupancy, equipment and supplies	61.4	60.9	62.0
Depreciation and amortization	64.4	73.8	76.3
Total operating expenses	1,114.2	1,233.1	1,429.1
OPERATING INCOME	103.0	52.0	18.5
Other expenses
Interest expense	92.4	77.0	53.6
Other non-operating expense (income)	4.5	39.3	(24.2)
Total other expenses	96.9	116.3	29.4
Income (loss) before income taxes	6.1	(64.3)	(10.9)
Income tax expense (benefit)	14.0	(4.0)	13.1
NET LOSS	$ (7.9)	$ (60.3)	$ (24.0)
LOSS PER COMMON SHARE
Basic (usd per share)	$ (0.10)	$ (0.85)	$ (0.37)
Diluted (usd per share)	$ (0.10)	$ (0.85)	$ (0.37)
Weighted-average outstanding common shares and equivalents used in computing loss per share
Basic	77.8	71.1	64.3
Diluted	77.8	71.1	64.3
Costs and Expenses	$ 1,114.2	$ 1,233.1	$ 1,429.1