Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Units	Common Stock	Preferred Equity	Partners’ Capital	Partners’ Capital Cumulative Effect, Period of Adoption, Adjustment	Additional Paid-in-Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interests in Consolidated Entities	Non- controlling Interests in Carlyle Holdings	Non- controlling Interests in Carlyle Holdings Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2018	$ 2,836.3	$ (0.7)			$ 387.5		$ (0.2)			$ (83.3)	$ 324.2	$ 1,534.5	$ (0.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares/units repurchased (in shares)			(1,600,000)
Shares/units repurchased	(34.5)					$ (34.5)
Net income (loss)	1,224.8				35.6	353.6					45.8	789.8
Redemption of preferred units (see Note 12)	(405.4)				(405.4)
Deconsolidation of Consolidated Entities	(11.2)										(11.2)
Foreign currency translation adjustments	(30.2)									(7.6)	(8.1)	(14.5)
Unrealized gains (losses) on Fortitude Re available-for-sale securities	17.0									5.6		11.4
Defined benefit plans, net	3.4									1.1		2.3
Ending balance at Sep. 30, 2019	3,295.5				0.0					(89.1)	310.1	2,098.0
Beginning balance (in units) at Dec. 31, 2018			107,700,000
Beginning balance at Dec. 31, 2018						673.4
Increase (Decrease) in Partners' Capital [Roll Forward]
Reallocation of ownership interests in Carlyle Holdings						49.6				(3.8)		(45.8)
Exchange of Carlyle Holdings units for common units (in units)			1,600,000
Exchange of Carlyle Holdings units for common units						14.7				(1.1)		(13.6)
Deferred tax effects resulting from acquisition of interests in Carlyle Holdings	1.0					1.0
Equity-based compensation	114.0					37.3						76.7
Issuances of common units for equity-based awards (in units)			9,600,000
Contributions	24.7										24.7
Distributions	$ (443.7)				(17.7)	(118.4)					(65.3)	(242.3)
Ending balance (in units) at Sep. 30, 2019			117,300,000
Ending balance at Sep. 30, 2019						976.5
Increase (Decrease) in Partners' Capital [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning balance at Jun. 30, 2019	$ 3,618.3				387.5					(77.8)	308.5	2,078.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares/units repurchased (in shares)			(1,000,000.0)
Shares/units repurchased	(22.5)					(22.5)
Net income (loss)	252.0
Redemption of preferred units (see Note 12)	(405.4)				(405.4)
Deconsolidation of Consolidated Entities	(11.2)										(11.2)
Foreign currency translation adjustments	(31.4)									(9.9)	(2.3)	(19.2)
Unrealized gains (losses) on Fortitude Re available-for-sale securities	4.6									1.6		3.0
Defined benefit plans, net	0.9									0.3		0.6
Ending balance at Sep. 30, 2019	3,295.5				0.0					(89.1)	310.1	2,098.0
Beginning balance (in units) at Jun. 30, 2019			110,700,000
Beginning balance at Jun. 30, 2019						921.2
Increase (Decrease) in Partners' Capital [Roll Forward]
Reallocation of ownership interests in Carlyle Holdings						34.2				(2.5)		(31.7)
Exchange of Carlyle Holdings units for common units (in units)			1,200,000
Exchange of Carlyle Holdings units for common units						11.4				(0.8)		(10.6)
Deferred tax effects resulting from acquisition of interests in Carlyle Holdings	0.6					0.6
Equity-based compensation	39.9					13.1						26.8
Issuances of common units for equity-based awards (in units)			6,400,000
Contributions	15.6										15.6
Distributions	(165.9)				(5.9)	(49.9)					(11.0)	(99.1)
Net income (loss)	252.0				$ 23.8	68.4					10.5	149.3
Ending balance (in units) at Sep. 30, 2019			117,300,000
Ending balance at Sep. 30, 2019						976.5
Beginning balance (in shares) at Dec. 31, 2019				0
Beginning balance at Dec. 31, 2019	$ 2,969.6			$ 0.0				$ 0.0	$ 0.0	(85.2)	333.5	2,017.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification resulting from Conversion - Partners' Capital (in shares)				117,800,000
Reclassification resulting from Conversion - Partners' Capital				$ 1.2				702.6
Reclassification resulting from Conversion - Non-controlling Interest in Carlyle Holdings (in shares)				229,400,000
Reclassification resulting from Conversion - Non-controlling Interest in Carlyle Holdings				$ 2.3				2,180.9		(165.7)		(2,017.5)
Shares/units repurchased (in shares)	(1,100,000)			(1,100,000)
Shares/units repurchased	$ (26.4)							(26.4)
Tax effects resulting from Conversion	(53.6)							(64.4)		10.8
Equity-based compensation	85.9							85.9
Shares issued for equity-based awards (in shares)				7,200,000
Contributions	24.2										24.2
Distributions	(316.4)							(262.9)			(53.5)
Net income (loss)	(171.8)								(170.6)		(1.2)
Deconsolidation of Consolidated Entities	(76.7)										(76.7)
Foreign currency translation adjustments	16.3									23.9	(7.6)
Unrealized gains (losses) on Fortitude Re available-for-sale securities	(20.0)									(20.0)
Defined benefit plans, net	$ (0.9)									(0.9)
Ending balance (in shares) at Sep. 30, 2020	353,269,793			353,300,000
Ending balance at Sep. 30, 2020	$ 2,430.2			$ 3.5				2,615.7	(170.6)	(237.1)	218.7	0.0
Beginning balance (in units) at Dec. 31, 2019	117,840,651		117,800,000
Beginning balance at Dec. 31, 2019						703.8
Increase (Decrease) in Partners' Capital [Roll Forward]
Reclassification resulting from Conversion - Partners' Capital (in shares)			(117,800,000)
Reclassification resulting from Conversion - Partners' Capital						(703.8)
Ending balance (in units) at Sep. 30, 2020			0
Ending balance at Sep. 30, 2020						0.0
Beginning balance (in shares) at Jun. 30, 2020				348,700,000
Beginning balance at Jun. 30, 2020	$ 2,142.7			$ 3.5				2,679.8	(466.1)	(258.9)	184.4	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares/units repurchased (in shares)	0
Equity-based compensation	$ 24.2							24.2
Shares issued for equity-based awards (in shares)				4,600,000
Contributions	10.2										10.2
Distributions	(106.6)							(88.3)			(18.3)
Net income (loss)	332.7								295.5		37.2
Foreign currency translation adjustments	27.0									21.8	5.2
Unrealized gains (losses) on Fortitude Re available-for-sale securities	$ 0.0
Ending balance (in shares) at Sep. 30, 2020	353,269,793			353,300,000
Ending balance at Sep. 30, 2020	$ 2,430.2			$ 3.5				$ 2,615.7	$ (170.6)	$ (237.1)	$ 218.7	$ 0.0
Beginning balance (in units) at Jun. 30, 2020			0
Beginning balance at Jun. 30, 2020						0.0
Ending balance (in units) at Sep. 30, 2020			0
Ending balance at Sep. 30, 2020						$ 0.0