Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Investment income (loss)	$ 1,898.0	$ 6,721.9	$ 1,095.2
Performance revenues related compensation expense	719.9	2,961.0	779.1
Performance allocations
Segment Reporting Information [Line Items]
Investment income (loss)	1,327.5	6,084.6	1,635.9
Performance revenues related compensation expense	719.9	2,961.0	779.1
Net performance revenues	607.6	3,123.6	856.8
Performance allocations | Adjustments
Segment Reporting Information [Line Items]
Investment income (loss)	(653.2)	3,146.0	1,049.8
Performance revenues related compensation expense	(262.3)	1,552.0	439.3
Net performance revenues	(390.9)	1,594.0	610.5
Performance allocations | Total Reportable Segments
Segment Reporting Information [Line Items]
Investment income (loss)	1,980.7	2,938.6	586.1
Performance revenues related compensation expense	982.2	1,409.0	339.8
Net performance revenues	998.5	1,529.6	246.3
Realized principal investment income
Segment Reporting Information [Line Items]
Investment income (loss)	570.5	637.3	(540.7)
Realized principal investment income | Adjustments
Segment Reporting Information [Line Items]
Investment income (loss)	419.9	427.8	(613.7)
Realized principal investment income | Total Reportable Segments
Segment Reporting Information [Line Items]
Investment income (loss)	$ 150.6	$ 209.5	$ 73.0