Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue:
Total revenue	$ 417.2	$ 523.8	$ 499.5
Operating expenses:
Impairment of goodwill	0.0	0.0
Total operating expenses	249.3	378.0	367.8
Operating income	167.9	145.8	131.7
Non-operating income and (expense):
Loss on extinguishment of debt	(3.2)
Gain on sale of subsidiaries		48.6
Total non-operating income	(23.1)	32.3	213.1
Income from continuing operations before taxes	144.8	178.1	344.8
Income tax expense	44.2	50.0	97.1
Income from continuing operations	100.6	128.1	247.7
Income from discontinued operations, net of tax	0.0	77.3	67.8
Gain on disposal of discontinued operations, net of tax	0.0	691.0	0.0
Net income	100.6	896.4	315.5
Net income attributable to non-controlling interests in consolidated Funds		68.0	28.8
Net income attributable to controlling interests	$ 100.6	$ 828.4	$ 286.7
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 2.39	$ 10.73	$ 3.53
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	2.33	10.29	3.49
Continuing operations earnings per share (basic) attributable to controlling interests (in dollars per share)	2.39	1.66	3.04
Continuing operations earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 2.33	$ 1.59	$ 3.01
Weighted average shares outstanding (in shares)	42,056,278	77,213,010	81,259,778
Weighted average diluted shares outstanding (in shares)	43,156,269	80,485,924	82,036,203
Consolidated Entity Excluding Consolidated Funds
Revenue:
Other revenue	$ 0.0	$ 5.7	$ 7.3
Operating expenses:
Compensation and benefits	159.2	284.6	243.1
General and administrative expense	71.1	71.2	88.0
Impairment of goodwill	0.0	0.0	16.4
Amortization of acquired intangibles	0.1	0.1	0.3
Depreciation and amortization	18.5	22.1	19.8
Non-operating income and (expense):
Investment income (loss)	0.2	8.3	4.9
Interest income	0.8	0.2	0.6
Interest expense	(20.5)	(24.8)	(28.5)
Loss on extinguishment of debt	(3.2)	0.0	0.0
Gain on sale of subsidiaries	0.0	48.6	241.3
Gain on disposal of discontinued operations, net of tax	0.0	691.0	0.0
Consolidated Funds
Revenue:
Total revenue	0.4	0.0	5.5
Operating expenses:
Total operating expenses	0.4	0.0	0.2
Non-operating income and (expense):
Net consolidated Funds’ investment gains (losses)	(0.4)	0.0	(5.2)
Income from discontinued operations, net of tax	0.0	77.3	67.8
Net income attributable to non-controlling interests in consolidated Funds	0.0	68.0	28.8
Management fees
Revenue:
Management fee revenue	367.4	433.3	478.9
Management fees | Consolidated Entity Excluding Consolidated Funds
Revenue:
Management fee revenue	367.4	433.3	478.9
Performance fees | Consolidated Entity Excluding Consolidated Funds
Revenue:
Management fee revenue	$ 49.4	$ 84.8	$ 7.8