Common Shareholders’ Equity and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	$ 698.2	$ 647.3
Ark (2)
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	465.2	410.4
HG Global
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	(18.4)	(13.4)
Kudu (3)
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	141.2	127.6
Bamboo
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	0.0	113.6
Distinguished (4)
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	73.7	0.0
Other
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	36.5	9.1
Ark - Management Equity Incentive
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	58.6	42.9
Kudu - Management Equity Incentive
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	52.3	$ 47.9
Distinguished - Management Equity Incentives
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Equity	$ 33.3
Ark (2)
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	27.90%	27.90%
HG Global
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	3.10%	3.10%
Kudu (3)
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	8.80%	9.60%
Bamboo
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	0.00%	27.20%
Distinguished (4)
Noncontrolling Interest [Line Items]
Noncontrolling Percentage	13.10%	0.00%