Accrued Compensation and Benefits - Components (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2018
Business Acquisition [Line Items]
Accrued performance allocations and incentive fee related compensation	$ 3,182.4	$ 3,625.3
Accrued bonuses	384.8	466.6
Employment-based contingent cash consideration	2.9	76.5
Accrued pension liability	8.6	9.5
Other	115.7	143.0
Total	3,694.4	4,320.9
Realized performance allocations and incentive fee-related compensation not yet paid	12.9	$ 26.7
Carlyle Aviation Partners/Apollo Aviation Group
Business Acquisition [Line Items]
Contingent consideration, estimated maximum range			$ 150.0
Payments for earn out	68.6
Earnout payable	2.4
Abingworth
Business Acquisition [Line Items]
Contingent consideration, estimated maximum range	130.0
Business combination, contingent consideration, liability	$ 0.5

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