Significant Transactions - Distinguished Programs (Details) - USD ($) $ in Millions			12 Months Ended
	Nov. 01, 2025	Sep. 02, 2025	Dec. 31, 2025	Dec. 31, 2024
Other Significant Transactions [Line Items]
Goodwill acquired			$ 690.8	$ 270.4
Distinguished (4)
Other Significant Transactions [Line Items]
Basic units outstanding percentage		31.40%
Subsidiary - Distinguished Managing General Agent
Other Significant Transactions [Line Items]
Basic ownership		55.50%	55.50%
Business combination, basic ownership interest acquired, percentage		1.70%
Ownership percentage, fully diluted		43.60%	43.60%
Subsidiary, ownership percentage economic interest falls		50.00%
Subsidiary - Distinguished Managing General Agent | Distinguished Management
Other Significant Transactions [Line Items]
Ownership percentage, fully diluted		24.70%
Ownership percentage basic units outstanding		4.20%
Distinguished Transaction
Other Significant Transactions [Line Items]
Business combination, consideration transferred		$ 224.8
Post-closing purchase price adjustment		0.5
Business combination, consideration transferred, liabilities incurred		50.0
Cash on hand		$ 6.8
Business combination, right to purchase units		1.35
Payments to acquire interest in subsidiaries and affiliates, additional contribution			$ 131.5
Assets and goodwill acquired		$ 743.9
Goodwill		618.8
Liabilities acquired		249.7
Redeemable noncontrolling interest		133.5
Nonredeemable noncontrolling interest		73.8
Transaction costs		6.8
Other intangible assets		$ 198.2
Distinguished Transaction, ScaleCo Program
Other Significant Transactions [Line Items]
Business combination, consideration transferred	$ 33.6
Goodwill acquired	23.6
Other intangible assets	$ 9.3