Segment Reporting - Total Segments to Partnership Income Before Provision for Taxes Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 2,963.9	$ 4,438.7	$ 8,782.1
Expenses	3,571.7	2,824.7	4,757.1
Other income (loss)	6.9	(41.5)	2.5
Distributable earnings	(600.9)	1,572.5	4,027.5
Total assets	21,176.0	21,403.0	21,250.4
Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues	3,405.1	4,401.4	4,950.1
Expenses	1,974.6	2,492.4	2,706.4
Other income (loss)	0.0	0.0	0.0
Distributable earnings	1,430.5	1,909.0	2,243.7
Total assets	13,898.1	14,792.8	14,498.2
Consolidated Funds | Consolidated Funds
Segment Reporting Information [Line Items]
Revenues	570.1	311.0	253.2
Expenses	460.3	255.3	217.8
Other income (loss)	6.9	(41.5)	2.5
Distributable earnings	116.7	14.2	37.9
Total assets	7,805.5	7,213.3	6,948.0
Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(1,011.3)	(273.7)	3,578.8
Expenses	1,136.8	77.0	1,832.9
Other income (loss)	0.0	0.0	0.0
Distributable earnings	(2,148.1)	(350.7)	1,745.9
Total assets	$ (527.6)	$ (603.1)	$ (195.8)