Investments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Percentage of performance fees related to certain Corporate Private Equity funds			25.00%
Gain (loss) from investments	$ 1,034.6	$ 768.6	$ 1,419.9	$ 2,916.7
Performance Fee Revenue | Customer concentration risk
Segment Reporting Information [Line Items]
Percentage of performance fees related to certain Corporate Private Equity funds	46.00%	33.00%		49.00%
Gain (loss) from investments	$ 217.9	$ 37.0	129.9	$ 350.6
Performance Fee Revenue | Customer concentration risk | Carlyle Partners VI, L.P.
Segment Reporting Information [Line Items]
Gain (loss) from investments	141.7	55.5	773.4	149.7
Performance Fee Revenue | Customer concentration risk | Carlyle Asia Partners IV, L.P.
Segment Reporting Information [Line Items]
Gain (loss) from investments	$ 112.4	(91.9)	323.5
Performance Fee Revenue | Customer concentration risk | Carlyle International Energy Partners I, LP
Segment Reporting Information [Line Items]
Gain (loss) from investments			$ (144.9)
Performance Fee Revenue | Customer concentration risk | AlpInvest Co & Secondary Investments
Segment Reporting Information [Line Items]
Gain (loss) from investments		58.1		80.2
Performance Fee Revenue | Customer concentration risk | Carlyle Asia Partners V, LP
Segment Reporting Information [Line Items]
Gain (loss) from investments		39.3
Performance Fee Revenue | Customer concentration risk | Carlyle Realty Partners VII, L.P.
Segment Reporting Information [Line Items]
Gain (loss) from investments		31.9
Performance Fee Revenue | Customer concentration risk | Carlyle Europe Technology Partners III, LP
Segment Reporting Information [Line Items]
Gain (loss) from investments		26.5
Performance Fee Revenue | Customer concentration risk | Carlyle Realty Partners V, L.P.
Segment Reporting Information [Line Items]
Gain (loss) from investments		20.3		187.3
Performance Fee Revenue | Customer concentration risk | Carlyle Partners V, LP
Segment Reporting Information [Line Items]
Gain (loss) from investments		14.3
Performance Fee Revenue | Customer concentration risk | Carlyle Strategic Partners IV, L.P.
Segment Reporting Information [Line Items]
Gain (loss) from investments		(4.7)
Performance Fee Revenue | Customer concentration risk | Carlyle European Partners IV, L.P.
Segment Reporting Information [Line Items]
Gain (loss) from investments		(33.0)
Performance Fee Revenue | Customer concentration risk | NGP XI
Segment Reporting Information [Line Items]
Gain (loss) from investments		$ (73.6)		$ (79.3)