Segment Reporting - Expense 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 performance revenues related compensation	$ 200.6	$ 29.0	$ 98.0	$ 259.6
Equity-based compensation	18.7	36.6	78.3	107.8
Other non-operating (income) expense	0.6	0.3	1.3	1.0
Costs and Expenses	643.4	505.3	1,498.1	1,636.1
Total Reportable Segments
Segment Reporting Information [Line Items]
Unrealized performance revenues related compensation	207.2	38.8	76.8	269.7
Costs and Expenses	344.7	367.1	1,134.6	1,054.5
Reconciling Items
Segment Reporting Information [Line Items]
Equity-based compensation	21.1	38.9	87.4	116.6
Acquisition related charges and amortization of intangibles and impairment	18.5	11.2	28.6	38.6
Other non-operating (income) expense	0.6	0.3	1.3	1.0
Tax expense associated with performance revenues	(7.8)	(10.8)	4.1	(13.3)
Non-Carlyle economic interests in acquired business and other adjustments to present certain costs on a net-basis	19.2	14.9	32.4	45.8
Debt extinguishment costs	0.0	0.0	0.0	0.1
Severance and other adjustments	2.8	10.8	10.9	23.4
Costs and Expenses	250.8	94.1	214.7	457.0
Adjustments
Segment Reporting Information [Line Items]
Equity-based compensation	0.0	0.0	0.0	0.0
Other non-operating (income) expense	0.0	0.0	0.0	0.0
Costs and Expenses	$ (10.8)	$ (10.0)	$ (26.8)	$ (24.9)