Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue	$ 170.7	$ 205.9	$ 349.2	$ 413.4
Total revenue	174.7	207.1	357.3	414.3
Operating expenses:
Impairment of goodwill	0.0	0.0	16.4	0.0
Amortization of acquired intangibles	1.9	1.7	3.5	3.3
Total operating expenses	148.5	160.5	257.0	299.7
Operating income	26.2	46.6	100.3	114.6
Non-operating income and (expense):
Net consolidated Funds’ investment gains (losses)	42.2	(2.4)	11.3	18.2
Total non-operating income (loss)	35.0	(10.9)	(3.4)	3.8
Income from continuing operations before taxes	61.2	35.7	96.9	118.4
Income tax expense	7.3	14.1	20.9	35.7
Income from continuing operations	53.9	21.6	76.0	82.7
Gain (loss) on disposal of discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income	53.9	21.6	76.0	82.7
Net income (loss) attributable to non-controlling interests in consolidated Funds	35.0	(6.4)	24.5	2.0
Net income attributable to controlling interests	$ 18.9	$ 28.0	$ 51.5	$ 80.7
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 0.23	$ 0.31	$ 0.62	$ 0.85
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	0.23	0.31	0.62	0.85
Continuing operations earnings per share (basic) attributable to controlling interests (in dollars per share)	0.23	0.31	0.62	0.85
Continuing operations earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 0.23	$ 0.31	$ 0.62	$ 0.85
Weighted average ordinary shares outstanding (in shares)	80,435,389	91,457,301	82,758,277	94,550,527
Weighted average diluted ordinary shares outstanding (in shares)	80,449,124	91,495,633	82,774,091	94,669,475
Investments in unconsolidated Funds
Revenue:
Other revenue	$ 2.0	$ 1.5	$ 3.6	$ 2.9
Operating expenses:
Compensation and benefits	116.9	123.7	174.3	224.8
General and administrative expense	24.5	31.1	52.2	63.6
Impairment of goodwill			16.4	0.0
Amortization of acquired intangibles	1.9	1.7	3.5	3.3
Depreciation and other amortization	5.1	4.0	10.4	7.8
Non-operating income and (expense):
Investment income (loss)	6.6	2.1	(7.1)	9.1
Interest income	0.2	0.3	0.5	1.4
Interest expense	(7.4)	(8.8)	(15.2)	(15.8)
Consolidated Funds
Revenue:
Total revenue	1.7	1.9	3.2	3.0
Operating expenses:
Total operating expenses	0.1	0.0	0.2	0.2
Non-operating income and (expense):
Net consolidated Funds’ investment gains (losses)	35.6	(4.5)	18.4	9.1
Net income (loss) attributable to non-controlling interests in consolidated Funds	35.0	(6.4)	24.5	2.0
Management fees
Revenue:
Revenue	170.7	205.9	349.2	413.4
Management fees | Investments in unconsolidated Funds
Revenue:
Revenue	170.7	205.9	349.2	413.4
Performance fees | Investments in unconsolidated Funds
Revenue:
Revenue	$ 0.3	$ (2.2)	$ 1.3	$ (5.0)