Investments - Accrued Performance Allocations (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Accrued performance allocations	$ 6,169.9	$ 7,117.7
Global Private Equity
Segment Reporting Information [Line Items]
Accrued performance allocations	4,310.7	5,577.1
Global Credit
Segment Reporting Information [Line Items]
Accrued performance allocations	323.4	193.9
Global Investment Solutions
Segment Reporting Information [Line Items]
Accrued performance allocations	$ 1,535.8	$ 1,346.7