Segment Reporting - Reportable Segments Financial Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fund level fee revenues
Investment income	$ 286.3	$ (254.0)	$ 202.4	$ (81.5)
Interest income	52.1	50.2	109.7	94.2
Total revenues	1,069.7	462.1	1,758.1	1,321.1
Compensation and benefits
Cash-based compensation and benefits	206.3	270.6	428.2	530.8
Realized performance revenues related compensation	144.2	(92.2)	71.4	13.5
Total compensation and benefits	475.7	246.4	733.1	666.7
General, administrative, and other indirect expenses	187.9	168.5	335.6	327.7
Interest expense	30.4	30.7	61.2	60.4
Total expenses	845.8	547.7	1,406.5	1,250.7
Distributable Earnings	218.8	(70.0)	339.5	89.6
Realized net performance revenues	54.0	(154.6)	(30.2)	(99.5)
Consolidated VIEs, assets	22,284.1		22,284.1		$ 21,176.0
Total Reportable Segments
Compensation and benefits
Distributable Earnings	343.2	388.8	774.5	660.4
Realized net performance revenues	55.7	175.1
Realized principal investment income	26.6	22.1
Net interest	12.1	15.7
Fee Related Earnings	273.0	207.3	539.3	400.7
Total Reportable Segments | Global Segments
Fund level fee revenues
Total fund level fee revenues	587.5	606.4	1,158.9	1,157.8
Interest income	18.3	14.3	38.4	28.2
Total revenues	788.9	977.9	1,811.9	1,732.1
Compensation and benefits
Cash-based compensation and benefits	205.3	288.7	419.6	549.3
Realized performance revenues related compensation	100.8	160.0	356.6	255.6
Total compensation and benefits	306.1	448.7	776.2	804.9
General, administrative, and other indirect expenses	97.9	101.7	177.6	189.2
Depreciation and amortization expense	11.3	8.7	22.4	18.6
Interest expense	30.4	30.0	61.2	59.0
Total expenses	445.7	589.1	1,037.4	1,071.7
Distributable Earnings	343.2	388.8	774.5	660.4
Realized net performance revenues	55.7	175.1	197.7	244.6
Realized principal investment income	26.6	22.1	60.3	45.9
Net interest	12.1	15.7	22.8	30.8
Fee Related Earnings	273.0	207.3	539.3	400.7
Consolidated VIEs, assets	13,147.2	13,838.7	13,147.2	13,838.7
Total Reportable Segments | Global Private Equity
Fund level fee revenues
Total fund level fee revenues	312.2	388.3	627.6	730.2
Interest income	6.5	5.5	14.1	10.9
Total revenues	455.2	720.7	1,170.9	1,178.9
Compensation and benefits
Cash-based compensation and benefits	103.9	173.6	213.2	322.3
Realized performance revenues related compensation	81.4	144.6	315.7	190.9
Total compensation and benefits	185.3	318.2	528.9	513.2
General, administrative, and other indirect expenses	50.2	59.1	88.8	116.2
Depreciation and amortization expense	6.5	5.9	12.9	12.6
Interest expense	14.1	16.8	28.1	33.4
Total expenses	256.1	400.0	658.7	675.4
Distributable Earnings	199.1	320.7	512.2	503.5
Realized net performance revenues	48.3	169.1	187.8	221.8
Realized principal investment income	6.8	13.2	25.7	25.1
Net interest	7.6	11.3	14.0	22.5
Fee Related Earnings	151.6	149.7	312.7	279.1
Consolidated VIEs, assets	7,137.3	8,813.9	7,137.3	8,813.9
Total Reportable Segments | Global Credit
Fund level fee revenues
Total fund level fee revenues	193.8	159.4	374.5	311.4
Interest income	10.1	7.7	20.8	14.9
Total revenues	230.0	180.9	435.8	376.8
Compensation and benefits
Cash-based compensation and benefits	74.0	84.6	150.8	165.0
Realized performance revenues related compensation	4.3	2.7	4.6	15.4
Total compensation and benefits	78.3	87.3	155.4	180.4
General, administrative, and other indirect expenses	35.3	25.6	64.9	47.3
Depreciation and amortization expense	3.2	1.7	6.3	3.7
Interest expense	13.4	10.9	27.3	21.1
Total expenses	130.2	125.5	253.9	252.5
Distributable Earnings	99.8	55.4	181.9	124.3
Realized net performance revenues	2.6	2.9	2.9	17.9
Realized principal investment income	19.2	8.2	33.0	17.2
Net interest	3.3	3.2	6.5	6.2
Fee Related Earnings	81.3	47.5	152.5	95.4
Consolidated VIEs, assets	3,765.8	3,074.9	3,765.8	3,074.9
Total Reportable Segments | Global Investment Solutions
Fund level fee revenues
Total fund level fee revenues	81.5	58.7	156.8	116.2
Interest income	1.7	1.1	3.5	2.4
Total revenues	103.7	76.3	205.2	176.4
Compensation and benefits
Cash-based compensation and benefits	27.4	30.5	55.6	62.0
Realized performance revenues related compensation	15.1	12.7	36.3	49.3
Total compensation and benefits	42.5	43.2	91.9	111.3
General, administrative, and other indirect expenses	12.4	17.0	23.9	25.7
Depreciation and amortization expense	1.6	1.1	3.2	2.3
Interest expense	2.9	2.3	5.8	4.5
Total expenses	59.4	63.6	124.8	143.8
Distributable Earnings	44.3	12.7	80.4	32.6
Realized net performance revenues	4.8	3.1	7.0	4.9
Realized principal investment income	0.6	0.7	1.6	3.6
Net interest	1.2	1.2	2.3	2.1
Fee Related Earnings	40.1	10.1	74.1	26.2
Consolidated VIEs, assets	2,244.1	1,949.9	2,244.1	1,949.9
Fund management fees
Fund level fee revenues
Total fund level fee revenues	534.4	507.8	1,058.0	1,008.6
Fund management fees | Total Reportable Segments | Global Segments
Fund level fee revenues
Total fund level fee revenues	525.5	515.0	1,041.1	1,021.2
Fund management fees | Total Reportable Segments | Global Private Equity
Fund level fee revenues
Total fund level fee revenues	305.2	330.2	609.8	657.1
Fund management fees | Total Reportable Segments | Global Credit
Fund level fee revenues
Total fund level fee revenues	140.8	126.9	277.7	249.5
Fund management fees | Total Reportable Segments | Global Investment Solutions
Fund level fee revenues
Total fund level fee revenues	79.5	57.9	153.6	114.6
Portfolio advisory and transaction fees, net and other | Total Reportable Segments | Global Segments
Fund level fee revenues
Total fund level fee revenues	28.9	18.2	55.6	34.6
Portfolio advisory and transaction fees, net and other | Total Reportable Segments | Global Private Equity
Fund level fee revenues
Total fund level fee revenues	3.8	5.3	10.9	10.7
Portfolio advisory and transaction fees, net and other | Total Reportable Segments | Global Credit
Fund level fee revenues
Total fund level fee revenues	25.0	12.9	44.6	23.9
Portfolio advisory and transaction fees, net and other | Total Reportable Segments | Global Investment Solutions
Fund level fee revenues
Total fund level fee revenues	0.1	0.0	0.1	0.0
Fee related performance revenues | Global Investment Solutions
Fund level fee revenues
Total fund level fee revenues		0.8
Fee related performance revenues | Total Reportable Segments | Global Segments
Fund level fee revenues
Total fund level fee revenues	33.1	73.2	62.2	102.0
Fee related performance revenues | Total Reportable Segments | Global Private Equity
Fund level fee revenues
Total fund level fee revenues	3.2	52.8	6.9	62.4
Fee related performance revenues | Total Reportable Segments | Global Credit
Fund level fee revenues
Total fund level fee revenues	28.0	19.6	52.2	38.0
Fee related performance revenues | Total Reportable Segments | Global Investment Solutions
Fund level fee revenues
Total fund level fee revenues	1.9		3.1	1.6
Performance revenues
Fund level fee revenues
Investment income	198.2	(246.8)	41.2	(86.0)
Performance revenues | Total Reportable Segments | Global Segments
Fund level fee revenues
Investment income	156.5	335.1	554.3	500.2
Performance revenues | Total Reportable Segments | Global Private Equity
Fund level fee revenues
Investment income	129.7	313.7	503.5	412.7
Performance revenues | Total Reportable Segments | Global Credit
Fund level fee revenues
Investment income	6.9	5.6	7.5	33.3
Performance revenues | Total Reportable Segments | Global Investment Solutions
Fund level fee revenues
Investment income	19.9	15.8	43.3	54.2
Principal investment income (loss)
Fund level fee revenues
Investment income	88.1	(7.2)	161.2	4.5
Principal investment income (loss) | Total Reportable Segments | Global Segments
Fund level fee revenues
Investment income	26.6	22.1	60.3	45.9
Principal investment income (loss) | Total Reportable Segments | Global Private Equity
Fund level fee revenues
Investment income	6.8	13.2	25.7	25.1
Principal investment income (loss) | Total Reportable Segments | Global Credit
Fund level fee revenues
Investment income	19.2	8.2	33.0	17.2
Principal investment income (loss) | Total Reportable Segments | Global Investment Solutions
Fund level fee revenues
Investment income	$ 0.6	$ 0.7	$ 1.6	$ 3.6