Segment Reporting - Expense Adjustments (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Unrealized performance revenues related compensation	$ 16.7		$ 200.6	$ 1,566.0	$ 98.0
Equity-based compensation	42.4		18.7	122.0	78.3
Right-of-use asset impairment		$ 26.8		24.8	0.0
Expenses	938.1		643.4	3,674.3	1,498.1
Total Reportable Segments
Segment Reporting Information [Line Items]
Unrealized performance revenues related compensation	15.0		207.2	1,567.1	76.8
Expenses	793.2		344.7	1,714.4	1,134.6
Reconciling Items
Segment Reporting Information [Line Items]
Equity-based compensation	44.3		21.1	129.5	87.4
Acquisition or disposition-related charges (credits) and amortization of intangibles	24.4		18.5	54.7	28.6
Tax expense associated with certain foreign performance revenues related compensation	(2.5)		(7.8)	(12.1)	4.1
Non-Carlyle economic interests in acquired businesses and other adjustments to present certain costs on a net basis	15.9		19.2	53.2	32.4
Right-of-use asset impairment	0.0		0.0	26.8	0.0
Other adjustments including severance and C-Corp. conversion costs in 2020	3.2		3.4	7.2	12.2
Expenses	93.0		250.8	1,797.3	214.7
Adjustments
Segment Reporting Information [Line Items]
Equity-based compensation	0.0		0.0	0.0	0.0
Expenses	$ (7.3)		$ (10.8)	$ (29.1)	$ (26.8)