Segment Reporting - Reconciliation of Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Income (loss) before provision for income taxes	$ 85.8	$ 788.8	$ 697.4	$ 1,128.3
Adjustments:
Unrealized principal investment (income) loss	519.0	(1,831.5)	(334.8)	(2,033.9)
Net income attributable to non-controlling interests in consolidated entities	111.6	20.0	148.6	54.3
(=) Distributable Earnings	85.8	788.8	697.4	1,128.3
Total Reportable Segments
Adjustments:
Net unrealized performance and fee related performance revenues	244.6	(564.4)	210.3	(386.4)
(=) Distributable Earnings	368.4	367.1	1,254.8	1,141.6
Fee Related Earnings	311.9	277.9	945.8	817.2
Total Reportable Segments \| Global Segments
Adjustments:
(=) Distributable Earnings	368.4	367.1	1,254.8	1,141.6
Realized principal investment income (loss)	49.5	9.1	113.0	69.4
Net interest	12.1	10.5	38.2	33.3
Fee Related Earnings	311.9	277.9	945.8	817.2
Reconciling Items
Adjustments:
Equity-based compensation	88.2	122.0	289.3	360.4
Acquisition or disposition-related charges, including amortization of intangibles and impairment	46.2	37.4	216.7	103.5
Tax (expense) benefit associated with certain foreign performance revenues	(0.4)	(0.2)	(0.5)	(1.4)
Net income attributable to non-controlling interests in consolidated entities	(111.6)	(20.0)	(148.6)	(54.3)
Other adjustments	8.2	5.3	25.3	45.8
(=) Distributable Earnings	(373.4)	399.7	(688.2)	(49.7)
Unrealized principal investment income (loss) \| Reconciling Items
Adjustments:
Unrealized principal investment (income) loss	7.4	(1.8)	(35.1)	(54.3)
Performance allocations
Adjustments:
Unrealized principal investment (income) loss	606.7	(1,785.5)	(255.0)	(1,826.7)
Realized performance revenues, net of related compensation	(282.1)	634.5	(35.4)	604.3
Performance allocations \| Total Reportable Segments \| Global Segments
Adjustments:
Realized performance revenues, net of related compensation	$ 19.1	$ 90.6	$ 234.2	$ 288.3

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