Segment Reporting - Revenue Adjustments (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]
Unrealized principal investment income (loss)			$ (646.3)	$ 775.1
Revenues	$ 1,034.6	$ 768.6	1,419.9	2,916.7
Reconciling Items
Segment Reporting Information [Line Items]
Unrealized performance revenues	387.6	(87.4)	315.7	381.7
Unrealized principal investment income (loss)	81.0	198.7	(643.2)	672.2
Adjustments related to expenses associated with investments in NGP Management and its affiliates	(4.0)	(4.1)	(11.8)	(12.2)
Tax expense associated with certain performance revenues	(0.1)	0.2	0.0	0.2
Non-Carlyle economic interests in acquired businesses and other adjustments to present certain costs on a net basis	57.6	29.3	36.7	92.4
Revenues	481.8	189.5	(404.4)	1,237.8
Reconciling Items | Fortitude Re
Segment Reporting Information [Line Items]
Unrealized principal investment income (loss)	0.0	68.1	(104.4)	135.2
Adjustments
Segment Reporting Information [Line Items]
Revenues	$ (40.3)	$ (15.3)	$ 2.6	$ (31.7)