Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Significant Transactions - Outrigger Re (Details) - USD ($) $ in Millions			3 Months Ended			6 Months Ended
	Apr. 01, 2025	Dec. 20, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2025
Redeemable Preferred Stock \| Outrigger Re Ltd
Other Significant Transactions [Line Items]
Issuances of common shares		$ 250.0
Outrigger Re
Other Significant Transactions [Line Items]
Business combination, consideration transferred					$ 205.0
Enterprise Solution
Other Significant Transactions [Line Items]
Business combination, consideration transferred	$ 58.3
Outrigger Re
Other Significant Transactions [Line Items]
Ceded unearned premiums			$ 230.0	$ 250.0
Rollover amount			130.0	130.0
Return of capital				$ 75.0		$ 68.1
Total commitment			150.0
Short-term investments, at fair value			$ 203.7				$ 220.2