Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue:
Total revenue	$ 123.1	$ 107.3	$ 337.8	$ 295.4
Operating expenses:
Total operating expenses	96.1	77.1	267.3	225.0
Operating income	27.0	30.2	70.5	70.4
Non-operating income and (expense):
Investment income (loss)	5.5	0.4	9.0	2.0
Total non-operating income (loss)	1.4	(2.7)	(3.2)	(8.8)
Income before income taxes	28.4	27.5	67.3	61.6
Income tax expense	9.4	7.7	21.1	18.3
Net income	19.0	19.8	46.2	43.3
Net income attributable to non-controlling interests in consolidated Funds	2.1	0.2	3.7	0.3
Net income attributable to controlling interests	$ 16.9	$ 19.6	$ 42.5	$ 43.0
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 0.46	$ 0.47	$ 1.12	$ 1.04
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 0.45	$ 0.46	$ 1.10	$ 1.01
Weighted average common stock outstanding (in shares)	37,070,795	41,508,143	37,891,015	41,479,116
Weighted average diluted common stock outstanding (in shares)	37,794,164	42,589,717	38,585,072	42,648,805
Management fees
Revenue:
Total revenue	$ 112.1	$ 95.3	$ 319.8	$ 278.7
Consolidated Entity Excluding Consolidated Funds
Operating expenses:
Compensation and benefits	69.6	53.0	189.9	150.6
General and administrative expense	21.8	18.8	62.9	59.0
Depreciation and amortization	4.5	4.5	14.1	12.7
Non-operating income and (expense):
Investment income (loss)	1.5	(0.3)	2.5	0.2
Interest income	0.6	1.7	2.8	4.3
Interest expense	(4.7)	(4.8)	(15.0)	(15.1)
Net income			46.2	43.3
Consolidated Entity Excluding Consolidated Funds | Management fees
Revenue:
Total revenue	112.1	95.3	319.8	278.7
Consolidated Entity Excluding Consolidated Funds | Performance fees
Revenue:
Total revenue	10.1	11.2	16.0	13.9
Consolidated Funds
Revenue:
Total revenue	0.9	0.8	2.0	2.8
Operating expenses:
Total operating expenses	0.2	0.8	0.4	2.7
Non-operating income and (expense):
Net consolidated Funds’ investment gains	4.0	0.7	6.5	1.8
Net income attributable to non-controlling interests in consolidated Funds	$ 2.1	$ 0.2	$ 3.7	$ 0.3