Noncontrolling Interests (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Noncontrolling Equity	$ 215.1	$ 188.1
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Equity	(3.3)	(0.6)
Ark
Noncontrolling Interest [Line Items]
Noncontrolling Equity	279.8	247.9
Kudu
Noncontrolling Interest [Line Items]
Noncontrolling Equity	94.5	75.1
Other
Noncontrolling Interest [Line Items]
Noncontrolling Equity	10.0	20.4
Total, excluding BAM
Noncontrolling Interest [Line Items]
Noncontrolling Equity	381.0	342.8
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Noncontrolling Equity	$ (165.9)	$ (154.7)
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	3.10%	3.10%
Ark
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	28.00%	28.00%
Kudu
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	10.80%	10.80%
BAM
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	100.00%	100.00%