Noncontrolling Interests (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Noncontrolling Equity	$ 649.2	$ 321.1
Ark
Noncontrolling Interest [Line Items]
Noncontrolling Equity	397.9	336.9
Noncontrolling equity attributable to management's equity incentives	40.3	21.0
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Equity	(9.3)	0.8
Kudu
Noncontrolling Interest [Line Items]
Noncontrolling Equity	133.7	113.8
Bamboo
Noncontrolling Interest [Line Items]
Noncontrolling Equity	117.6	0.0
Other
Noncontrolling Interest [Line Items]
Noncontrolling Equity	9.3	9.4
Total, excluding BAM
Noncontrolling Interest [Line Items]
Noncontrolling Equity	649.2	460.9
BAM
Noncontrolling Interest [Line Items]
Noncontrolling Equity	$ 0.0	$ (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	9.90%	10.50%
Bamboo
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	27.20%	0.00%
BAM
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	0.00%	100.00%