Noncontrolling Interests - Schedule of Noncontrolling Interest (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	$ 817.1	$ 647.3
Ark
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	480.7	410.4
HG Global
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	(11.9)	(13.4)
Kudu
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	135.5	127.6
Bamboo
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	97.8	113.6
Distinguished
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	75.3
Other
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	39.7	9.1
Total nonredeemable noncontrolling interests
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	817.1	647.3
Ark - Management Equity Incentive
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	66.6	42.9
Kudu - Management Equity Incentive
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	48.8	47.9
Bamboo - Management Equity Incentives
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	2.6	$ 0.0
Distinguished - Management Equity Incentives
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	$ 21.2
Ark
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	27.90%	27.90%
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	3.10%	3.10%
Kudu
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	8.80%	9.60%
Bamboo
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	27.20%	27.20%
Distinguished
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	13.10%