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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Significant Transactions - Outrigger Re (Details) $ in Millions		3 Months Ended
	Dec. 20, 2022 USD ($) account	Dec. 31, 2022 USD ($)	Sep. 30, 2023
Outrigger Re
Other Significant Transactions [Line Items]
Purchase price		$ 205.0
Subsidiary - WM Outrigger Re \| Preferred Stock
Other Significant Transactions [Line Items]
Basic ownership		100.00%	100.00%
Redeemable Preferred Stock \| Outrigger Re Ltd
Other Significant Transactions [Line Items]
Issuances of common shares	$ 250.0
Number of segregated accounts \| account	4