Segment Reporting - Total Segments to Partnership Income Before Provision for Taxes Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 4,438.7	$ 8,782.1	$ 2,934.6
Expenses	2,824.7	4,757.1	2,333.3
Other loss (income)	(41.5)	2.5	(21.3)
Distributable earnings	1,572.5	4,027.5	580.0
Total assets	21,403.0	21,250.4	15,644.8
Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues	4,401.4	4,950.1	2,289.5
Expenses	2,492.4	2,706.4	1,527.4
Other loss (income)	0.0	0.0	0.0
Distributable earnings	1,909.0	2,243.7	762.1
Total assets	14,792.8	14,498.2
Consolidated Funds | Consolidated Funds
Segment Reporting Information [Line Items]
Revenues	311.0	253.2	226.8
Expenses	255.3	217.8	206.2
Other loss (income)	(41.5)	2.5	(21.3)
Distributable earnings	14.2	37.9	(0.7)
Total assets	7,213.3	6,948.0
Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(273.7)	3,578.8	418.3
Expenses	77.0	1,832.9	599.7
Other loss (income)	0.0	0.0	0.0
Distributable earnings	(350.7)	1,745.9	$ (181.4)
Total assets	$ (603.1)	$ (195.8)