Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Revenue	$ 205.9	$ 226.4	$ 413.4	$ 471.4
Total revenue	207.1	233.9	414.3	483.6
Operating expenses:
Total operating expenses	160.5	218.6	299.7	442.7
Operating income	46.6	15.3	114.6	40.9
Non-operating income and (expense):
Total non-operating income (loss)	(10.9)	(9.2)	3.8	48.7
Income from continuing operations before taxes	35.7	6.1	118.4	89.6
Income tax expense	14.1	3.6	35.7	32.3
Income from continuing operations	21.6	2.5	82.7	57.3
Gain (loss) on disposal of discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income	21.6	2.5	82.7	57.3
Net income attributable to controlling interests	$ 28.0	$ 2.1	$ 80.7	$ 59.4
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$ 0.31	$ 0.02	$ 0.85	$ 0.54
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	0.31	0.02	0.85	0.54
Continuing operations earnings per share (basic) attributable to controlling interests (in dollars per share)	0.31	0.02	0.85	0.54
Continuing operations earnings per share (diluted) attributable to controlling interests (in dollars per share)	$ 0.31	$ 0.02	$ 0.85	$ 0.54
Weighted average ordinary shares outstanding (in shares)	91,457,301	108,445,541	94,550,527	108,918,328
Weighted average diluted ordinary shares outstanding (in shares)	91,495,633	108,621,121	94,669,475	109,104,247
Investments in unconsolidated Funds
Revenue:
Other revenue	$ 1.5	$ 3.3	$ 2.9	$ 5.8
Operating expenses:
Compensation and benefits	123.7	183.4	224.8	372.6
General and administrative expense	31.1	29.8	63.6	59.3
Amortization of acquired intangibles	1.7	1.7	3.3	3.3
Depreciation and other amortization	4.0	3.5	7.8	6.9
Non-operating income and (expense):
Investment income	2.1	(0.4)	9.1	65.7
Interest income	0.3	0.6	1.4	1.1
Interest expense	(8.8)	(6.1)	(15.8)	(12.4)
Gain (loss) on disposal of discontinued operations, net of tax			0.0	0.0
Consolidated Funds
Revenue:
Total revenue	1.9	1.2	3.0	1.4
Operating expenses:
Total operating expenses	0.0	0.2	0.2	0.6
Non-operating income and (expense):
Net consolidated Funds’ investment gains (losses)	(4.5)	(3.3)	9.1	(5.7)
Net income (loss) attributable to non-controlling interests in consolidated Funds	(6.4)	0.4	2.0	(2.1)
Management fees | Investments in unconsolidated Funds
Revenue:
Revenue	205.9	226.4	413.4	471.4
Performance fees | Investments in unconsolidated Funds
Revenue:
Revenue	$ (2.2)	$ 3.0	$ (5.0)	$ 5.0