Noncontrolling Interests (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Noncontrolling Equity	$ 420.2	$ 321.1
Ark
Noncontrolling Interest [Line Items]
Noncontrolling Equity	334.7	336.9
Noncontrolling equity attributable to management's equity incentives	17.9	21.0
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Equity	(0.4)	0.8
Kudu
Noncontrolling Interest [Line Items]
Noncontrolling Equity	114.4	113.8
Bamboo
Noncontrolling Interest [Line Items]
Noncontrolling Equity	111.3	0.0
Other
Noncontrolling Interest [Line Items]
Noncontrolling Equity	9.3	9.4
Total, excluding BAM
Noncontrolling Interest [Line Items]
Noncontrolling Equity	569.3	460.9
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Noncontrolling Equity	$ (149.1)	$ (139.8)
Ark
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	28.00%	28.00%
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	3.10%	3.10%
Kudu
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	10.60%	10.50%
Bamboo
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	27.20%	0.00%
BAM
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	100.00%	100.00%