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 - WM Outrigger Re (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
	Dec. 20, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Outrigger Re
Other Significant Transactions [Line Items]
Ceded unearned premiums		$ 230.0	$ 250.0		$ 230.0
Rollover amount		130.0	130.0
Net distributions			75.0		122.7
Commitment amount		150.0
Short-term investments, at fair value		$ 203.7	$ 265.3		$ 203.7
Outrigger Re
Other Significant Transactions [Line Items]
Business combination, consideration transferred				$ 205.0
Redeemable Preferred Stock \| Outrigger Re Ltd
Other Significant Transactions [Line Items]
Issuances of common shares	$ 250.0