Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
Total revenue	$ 109.0	$ 96.3	$ 214.7	$ 188.1
Operating expenses:
Total operating expenses	88.4	75.9	171.2	147.9
Operating income	20.6	20.4	43.5	40.2
Non-operating income and (expense):
Investment income	0.9	0.5	3.5	1.6
Total non-operating loss	(3.5)	(3.4)	(4.6)	(6.1)
Income before income taxes	17.1	17.0	38.9	34.1
Income tax expense	5.6	5.5	11.7	10.6
Net income	11.5	11.5	27.2	23.5
Net income attributable to non-controlling interests in consolidated Funds	0.5	0.1	1.6	0.1
Net income attributable to controlling interests	$ 11.0	$ 11.4	$ 25.6	$ 23.4
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 0.29	$ 0.27	$ 0.67	$ 0.56
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 0.29	$ 0.27	$ 0.66	$ 0.55
Weighted average common stock outstanding (in shares)	37,547,741	41,484,303	38,305,631	41,464,362
Weighted average diluted common stock outstanding (in shares)	38,238,620	42,645,419	38,985,030	42,678,109
Management fees
Revenue:
Total revenue	$ 105.5	$ 92.8	$ 207.7	$ 183.4
Consolidated Entity Excluding Consolidated Funds
Operating expenses:
Compensation and benefits	62.2	48.5	120.3	97.6
General and administrative expense	21.1	21.8	41.1	40.2
Depreciation and amortization	5.0	4.4	9.6	8.2
Non-operating income and (expense):
Investment income	0.1	0.2	1.0	0.5
Interest income	0.9	1.5	2.2	2.6
Interest expense	(5.3)	(5.4)	(10.3)	(10.3)
Net income			27.2	23.5
Consolidated Entity Excluding Consolidated Funds | Management fees
Revenue:
Total revenue	105.5	92.8	207.7	183.4
Consolidated Entity Excluding Consolidated Funds | Performance fees
Revenue:
Total revenue	2.8	2.2	5.9	2.7
Consolidated Funds
Revenue:
Total revenue	0.7	1.3	1.1	2.0
Operating expenses:
Total operating expenses	0.1	1.2	0.2	1.9
Non-operating income and (expense):
Net consolidated Funds’ investment gains	$ 0.8	$ 0.3	2.5	$ 1.1
Net income attributable to non-controlling interests in consolidated Funds			$ 1.6