Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue:
Revenue:	$ 107.3	$ 86.8	$ 295.4	$ 294.5
Operating expenses:
Total operating expenses	77.1	56.7	225.0	174.5
Operating income	30.2	30.1	70.4	120.0
Non-operating income and (expense):
Investment income (loss)	0.4	(0.4)	2.0	(1.2)
Loss on extinguishment of debt				(3.2)
Total non-operating loss	(2.7)	(4.8)	(8.8)	(20.0)
Income before income taxes	27.5	25.3	61.6	100.0
Income tax expense	7.7	7.5	18.3	29.8
Net income	19.8	17.8	43.3	70.2
Net income attributable to non-controlling interests in consolidated Funds	0.2	0.0	0.3	0.0
Net income attributable to controlling interests	$ 19.6	$ 17.8	$ 43.0	$ 70.2
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 0.47	$ 0.43	$ 1.04	$ 1.66
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 0.46	$ 0.42	$ 1.01	$ 1.62
Weighted average common stock outstanding (in shares)	41,508,143	41,431,729	41,479,116	42,266,420
Weighted average diluted common stock outstanding (in shares)	42,589,717	42,353,442	42,648,805	43,390,502
Management fees
Revenue:
Revenue:	$ 95.3	$ 85.7	$ 278.7	$ 281.4
Consolidated Entity Excluding Consolidated Funds
Operating expenses:
Compensation and benefits	53.0	34.9	150.6	108.7
General and administrative expense	18.8	17.5	59.0	50.9
Depreciation and amortization	4.5	4.2	12.7	14.8
Amortization of acquired intangibles	0.0	0.1	0.0	0.1
Non-operating income and (expense):
Investment income (loss)	(0.3)	(0.4)	0.2	(1.2)
Interest income	1.7	0.2	4.3	0.3
Interest expense	(4.8)	(4.6)	(15.1)	(15.9)
Loss on extinguishment of debt	0.0	0.0	0.0	(3.2)
Net income			43.3	70.2
Consolidated Entity Excluding Consolidated Funds | Management fees
Revenue:
Revenue:	95.3	85.7	278.7	281.4
Consolidated Entity Excluding Consolidated Funds | Performance fees
Revenue:
Revenue:	11.2	1.1	13.9	13.1
Consolidated Funds
Revenue:
Revenue:	0.8	0.0	2.8	0.0
Operating expenses:
Total operating expenses	0.8	0.0	2.7	0.0
Non-operating income and (expense):
Net consolidated Funds’ investment gains	$ 0.7	$ 0.0	$ 1.8	$ 0.0