Segment Reporting - Expense Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Equity-based compensation	$ 154.0	$ 163.1	$ 105.0
Right-of-use asset impairment		26.8
Expenses	2,824.7	4,757.1	2,333.3
Total Reportable Segments
Segment Reporting Information [Line Items]
Unrealized performance and fee related performance revenue related compensation expense	(326.2)	1,549.4	432.3
Expenses	2,492.4	2,706.4	1,527.4
Reconciling Items
Segment Reporting Information [Line Items]
Equity-based compensation	161.9	172.9	116.6
Acquisition or disposition-related charges and amortization of intangibles and impairment	187.4	37.7	38.1
Tax expense associated with certain foreign performance revenues	2.9	(17.3)	(8.4)
Non-controlling interests and other adjustments to present certain costs on a net basis	82.7	78.5	55.8
Debt extinguishment costs	0.0	10.2	0.0
Right-of-use asset impairment	0.0	26.8	0.0
Other adjustments, including severance and C-Corp. conversion costs in 2020	12.4	14.2	8.0
Expenses	77.0	1,832.9	599.7
Eliminations
Segment Reporting Information [Line Items]
Equity-based compensation	0.0	0.0	0.0
Expenses	$ (44.1)	$ (39.5)	$ (42.7)