Commitments and Contingencies - Additional Information (Details) € in Millions, £ in Millions			1 Months Ended	12 Months Ended			25 Months Ended
	Sep. 03, 2019 USD ($)	Jul. 07, 2010 USD ($)	Apr. 30, 2015 EUR (€)	Dec. 31, 2019 USD ($) obligation	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) finance_vehicle	Sep. 30, 2019 USD ($)	Sep. 30, 2019 GBP (£)	Dec. 31, 2019 EUR (€)	Jul. 31, 2019 EUR (€)	Jul. 31, 2018 USD ($)
Guarantor Obligations [Line Items]
Potential repayment of performance fees				$ 22,200,000	$ 63,200,000
Unbilled receivable for giveback obligations from current and former employees				1,400,000	1,400,000
Amount of giveback obligation of current and former related parties				14,100,000
Amount of net accrued giveback obligation of subsidiary				$ 8,100,000
Term of lease											15 years
Options to extend (up to)				5 years					5 years
Options to terminate (within)				1 year
Lease assignment and termination costs					63,500,000
Lease incentive											$ 3,500,000
Rent expense				$ 48,900,000	51,300,000	$ 56,600,000
Damages thought (more than)		$ 1,000,000,000.0
Proceeds from legal settlements							$ 30,900,000	£ 23.3
Investment income (loss)				$ 1,568,400,000	809,200,000	$ 2,290,600,000
Loss contingency accrual					35,000,000
Alleged Misappropriation of Investments in Petroleum Commodities
Guarantor Obligations [Line Items]
Number of structured finance vehicles managed by an affiliate that invested in petroleum commodities believed to be stolen | finance_vehicle						2
Amount of investment in petroleum commodities believed stolen						$ 400,000,000
Estimated insurance proceeds, including amounts to be distributed to former investors					55,000,000
Insurance proceeds recognized					32,000,000
Financial Guarantee, Employee Loans
Guarantor Obligations [Line Items]
Guaranteed loans	$ 100,000,000.0
Guaranteed loans, initial period	1 year
Guaranteed loans, floor interest rate	3.50%
Guaranteed loans, interest rate at period end				3.75%					3.75%
Guaranteed loans, floor interest rate at period end				4.05%					4.05%
Guarantor obligations, current carrying value				$ 10,100,000
Financial Guarantee, Employee Credit Facility
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value				1,500,000	10,300,000
Borrowings under credit facility				11,300,000
Contingent Obligations Giveback
Guarantor Obligations [Line Items]
Cash withheld from carried interest distributions for potential giveback obligations				164,400,000	176,100,000
Amount of realized and distributed carried interest subject to potential giveback on after-tax basis				400,000,000
French tax authority
Guarantor Obligations [Line Items]
Damages thought (more than) | €			€ 105.0
Payments for legal settlements | €			75.0
Refund awarded from other party, tax and penalties | €									€ 105.0
Refund awarded from other party, interest | €									€ 12.5
French tax authority | CEREP I
Guarantor Obligations [Line Items]
Payments for legal settlements | €			€ 30.0
Real Assets
Guarantor Obligations [Line Items]
Potential repayment of performance fees				17,200,000	$ 58,200,000
Amount paid during period for giveback obligation for a fund				$ 41,300,000
Number of giveback obligations paid off | obligation				2
Real Assets | Revolving Credit Facility for funds
Guarantor Obligations [Line Items]
Guaranteed loans				$ 130,000,000.0
Real Assets | Carlyle Holdings
Guarantor Obligations [Line Items]
Amount paid during period for giveback obligation for a fund				19,200,000
Real Assets | Current and former senior professionals
Guarantor Obligations [Line Items]
Amount paid during period for giveback obligation for a fund				22,100,000
Investment Solutions | Revolving Credit Facility for funds
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value				$ 10,600,000
Minimum
Guarantor Obligations [Line Items]
Term of lease				1 year					1 year
Maximum
Guarantor Obligations [Line Items]
Term of lease				15 years					15 years
Prime Rate | Financial Guarantee, Employee Loans
Guarantor Obligations [Line Items]
Guaranteed loans, plus (minus) spread on interest rate	(1.00%)
Index 12MAT | Financial Guarantee, Employee Loans
Guarantor Obligations [Line Items]
Guaranteed loans, plus (minus) spread on interest rate	2.00%
LIBOR rate
Guarantor Obligations [Line Items]
Applicable margin over base rate				1.50%
LIBOR rate | Financial Guarantee, Employee Credit Facility
Guarantor Obligations [Line Items]
Applicable margin over base rate				3.00%
Settled Litigation | French tax authority
Guarantor Obligations [Line Items]
Refund awarded from other party | €										€ 37.1
Investment income (loss)				$ 71,500,000
Settled Litigation | French tax authority | Partnership And CEREP I
Guarantor Obligations [Line Items]
Refund awarded from other party | €										€ 80.5