Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Total revenue	$ 523.8	$ 499.5	$ 594.6
Operating expenses:
Impairment of goodwill	0.0	16.4
Depreciation and amortization	22.1
Total operating expenses	378.0	367.8	372.4
Operating income	145.8	131.7	222.2
Non-operating income and (expense):
Gain on sale of subsidiaries	48.6	241.3
Total non-operating income	32.3	213.1	(9.0)
Income from continuing operations before taxes	178.1	344.8	213.2
Income tax expense	50.0	97.1	10.5
Income from continuing operations	128.1	247.7	202.7
Income from discontinued operations, net of tax	77.3	67.8	37.3
Gain on disposal of discontinued operations, net of tax	691.0	0.0	0.0
Net income	896.4	315.5	240.0
Net income attributable to non-controlling interests in consolidated Funds	68.0	28.8	16.1
Net income attributable to controlling interests	$ 828.4	$ 286.7	$ 223.9
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 10.73	$ 3.53	$ 2.45
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	10.29	3.49	2.45
Continuing operations earnings per share (basic) attributable to controlling interests (in dollars per share)	1.66	3.04	2.16
Continuing operations earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 1.59	$ 3.01	$ 2.16
Weighted average shares outstanding (in shares)	77,213,010	81,259,778	91,205,412
Weighted average diluted shares outstanding (in shares)	80,485,924	82,036,203	91,268,952
Consolidated Entity Excluding Consolidated Funds
Revenue:
Other revenue	$ 5.7	$ 7.3	$ 6.0
Operating expenses:
Compensation and benefits	284.6	243.1	248.6
General and administrative expense	71.2	88.0	107.1
Impairment of goodwill	0.0	16.4	0.0
Amortization of acquired intangibles	0.1	0.3	0.2
Depreciation and amortization	22.1	19.8	16.2
Non-operating income and (expense):
Investment income	8.3	4.9	16.8
Interest income	0.2	0.6	2.2
Interest expense	(24.8)	(28.5)	(32.2)
Gain on sale of subsidiaries	48.6	241.3	0.0
Gain on disposal of discontinued operations, net of tax		0.0
Consolidated Funds
Revenue:
Total revenue	0.0	5.5	6.6
Operating expenses:
Total operating expenses	0.0	0.2	0.3
Non-operating income and (expense):
Net consolidated Funds’ investment gains (losses)	0.0	(5.2)	4.2
Income from discontinued operations, net of tax	77.3	67.8	37.3
Net income attributable to non-controlling interests in consolidated Funds	68.0	28.8	16.1
Management fees
Revenue:
Management fee revenue	433.3	478.9	582.1
Management fees | Consolidated Entity Excluding Consolidated Funds
Revenue:
Management fee revenue	433.3	478.9	582.1
Performance fees | Consolidated Entity Excluding Consolidated Funds
Revenue:
Management fee revenue	$ 84.8	$ 7.8	$ (0.1)