Supplemental Financial Information - Financial Position (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 938.4		$ 793.4	$ 1,489.8
Cash and cash equivalents held at Consolidated Funds	377.8		122.4	124.1
Restricted cash	0.4		34.6	16.0
Investments, including accrued performance allocations of $4,184.2 million and $3,855.6 million as of September 30, 2020 and December 31, 2019, respectively	6,484.2		6,804.4
Investments of Consolidated Funds	5,414.8		5,007.3
Due from affiliates and other receivables, net	247.2		273.9
Due from affiliates and other receivables of Consolidated Funds, net	100.3		74.4
Fixed assets, net	133.9		108.2
Lease right-of-use assets, net	187.7		203.8
Deposits and other	53.5		54.0
Intangible assets, net	51.9		62.3
Deferred tax assets	212.1		270.1
Total assets	14,202.2		13,808.8
Liabilities and equity
Debt obligations	1,987.1		1,976.3
Loans payable of Consolidated Funds	5,263.7		4,706.7
Accounts payable, accrued expenses and other liabilities	311.8		354.9
Accrued compensation and benefits	2,684.2		2,496.5
Due to affiliates	448.0		542.1
Deferred revenue	272.3		71.0
Deferred tax liabilities	47.2		65.2
Other liabilities of Consolidated Funds	475.2		316.1
Lease liabilities	265.0		288.2
Accrued giveback obligations	17.5		22.2
Total liabilities	11,772.0		10,839.2
Common stock	3.5		0.0
Additional paid-in-capital	2,615.7		0.0
Retained earnings (deficit)	(170.6)		0.0
Partners’ capital	0.0		703.8
Accumulated other comprehensive loss	(237.1)		(85.2)
Non-controlling interests in consolidated entities	218.7		333.5
Non-controlling interests in Carlyle Holdings	0.0		2,017.5
Total equity	2,430.2	$ 2,142.7	2,969.6	3,295.5	$ 3,618.3	$ 2,836.3
Total liabilities and equity	14,202.2		13,808.8
Accrued performance allocations	4,184.2		3,855.6
Consolidated Operating Entities
Assets
Cash and cash equivalents	938.4			1,489.8
Cash and cash equivalents held at Consolidated Funds	377.8			124.1
Restricted cash	0.4			$ 16.0
Consolidated Entities and Consolidated Funds
Assets
Total assets	5,893.1
Consolidated Entities and Consolidated Funds | Consolidated Operating Entities
Assets
Cash and cash equivalents	938.4		793.4
Cash and cash equivalents held at Consolidated Funds	0.0		0.0
Restricted cash	0.4		34.6
Investments, including accrued performance allocations of $4,184.2 million and $3,855.6 million as of September 30, 2020 and December 31, 2019, respectively	6,629.8		6,982.7
Investments of Consolidated Funds	0.0		0.0
Due from affiliates and other receivables, net	253.1		279.0
Due from affiliates and other receivables of Consolidated Funds, net	0.0		0.0
Fixed assets, net	133.9		108.2
Lease right-of-use assets, net	187.7		203.8
Deposits and other	53.3		53.8
Intangible assets, net	51.9		62.3
Deferred tax assets	212.1		270.1
Total assets	8,460.6		8,787.9
Liabilities and equity
Debt obligations	1,987.1		1,976.3
Loans payable of Consolidated Funds	0.0		0.0
Accounts payable, accrued expenses and other liabilities	311.8		354.9
Accrued compensation and benefits	2,684.2		2,496.5
Due to affiliates	448.0		542.1
Deferred revenue	272.4		71.0
Deferred tax liabilities	47.2		65.2
Other liabilities of Consolidated Funds	0.0		0.0
Lease liabilities	265.0		288.2
Accrued giveback obligations	17.5		22.2
Total liabilities	6,033.2		5,816.4
Common stock	3.5
Additional paid-in-capital	2,615.7
Retained earnings (deficit)	(170.6)
Partners’ capital			703.8
Accumulated other comprehensive loss	(234.7)		(84.5)
Non-controlling interests in consolidated entities	213.5		333.4
Non-controlling interests in Carlyle Holdings			2,018.8
Total equity	2,427.4		2,971.5
Total liabilities and equity	8,460.6		8,787.9
Consolidated Entities and Consolidated Funds | Consolidated Funds
Assets
Cash and cash equivalents	0.0		0.0
Cash and cash equivalents held at Consolidated Funds	377.8		122.4
Restricted cash	0.0		0.0
Investments, including accrued performance allocations of $4,184.2 million and $3,855.6 million as of September 30, 2020 and December 31, 2019, respectively	0.0		0.0
Investments of Consolidated Funds	5,414.8		5,007.3
Due from affiliates and other receivables, net	0.0		0.0
Due from affiliates and other receivables of Consolidated Funds, net	100.3		74.4
Fixed assets, net	0.0		0.0
Lease right-of-use assets, net	0.0		0.0
Deposits and other	0.2		0.2
Intangible assets, net	0.0		0.0
Deferred tax assets	0.0		0.0
Total assets	5,893.1		5,204.3
Liabilities and equity
Debt obligations	0.0		0.0
Loans payable of Consolidated Funds	5,263.7		4,706.7
Accounts payable, accrued expenses and other liabilities	0.0		0.0
Accrued compensation and benefits	0.0		0.0
Due to affiliates	0.0		0.0
Deferred revenue	0.0		0.0
Deferred tax liabilities	0.0		0.0
Other liabilities of Consolidated Funds	475.2		316.1
Lease liabilities	0.0		0.0
Accrued giveback obligations	0.0		0.0
Total liabilities	5,738.9		5,022.8
Common stock	0.0
Additional paid-in-capital	147.4
Retained earnings (deficit)	0.0
Partners’ capital			61.7
Accumulated other comprehensive loss	1.6		(0.1)
Non-controlling interests in consolidated entities	5.2		0.1
Non-controlling interests in Carlyle Holdings			119.8
Total equity	154.2		181.5
Total liabilities and equity	5,893.1		5,204.3
Eliminations
Assets
Cash and cash equivalents	0.0		0.0
Cash and cash equivalents held at Consolidated Funds	0.0		0.0
Restricted cash	0.0		0.0
Investments, including accrued performance allocations of $4,184.2 million and $3,855.6 million as of September 30, 2020 and December 31, 2019, respectively	(145.6)		(178.3)
Investments of Consolidated Funds	0.0		0.0
Due from affiliates and other receivables, net	(5.9)		(5.1)
Due from affiliates and other receivables of Consolidated Funds, net	0.0		0.0
Fixed assets, net	0.0		0.0
Lease right-of-use assets, net	0.0		0.0
Deposits and other	0.0		0.0
Intangible assets, net	0.0		0.0
Deferred tax assets	0.0		0.0
Total assets	(151.5)		(183.4)
Liabilities and equity
Debt obligations	0.0		0.0
Loans payable of Consolidated Funds	0.0		0.0
Accounts payable, accrued expenses and other liabilities	0.0		0.0
Accrued compensation and benefits	0.0		0.0
Due to affiliates	0.0		0.0
Deferred revenue	(0.1)		0.0
Deferred tax liabilities	0.0		0.0
Other liabilities of Consolidated Funds	0.0		0.0
Lease liabilities	0.0		0.0
Accrued giveback obligations	0.0		0.0
Total liabilities	(0.1)		0.0
Common stock	0.0
Additional paid-in-capital	(147.4)
Retained earnings (deficit)	0.0
Partners’ capital			(61.7)
Accumulated other comprehensive loss	(4.0)		(0.6)
Non-controlling interests in consolidated entities	0.0		0.0
Non-controlling interests in Carlyle Holdings			(121.1)
Total equity	(151.4)		(183.4)
Total liabilities and equity	$ (151.5)		$ (183.4)