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Recent Acquisitions, Disposals & Other Transactions - Merger (Details) - Argo Group International Holdings, Inc. - Brookfield Wealth Solutions - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended
Nov. 16, 2023
Nov. 15, 2023
Dec. 31, 2023
Business Acquisition [Line Items]      
Consideration transferred $ 1,058.9    
Number of common stock shares canceled (in shares)   35,221,291 35,221,291
Bargain purchase gain 48.9    
Common Stock      
Business Acquisition [Line Items]      
Equity interests issued and issuable $ 1,056.6    
Equity interests issued and issuable (in dollars per share) $ 30.00    
Employee Stock      
Business Acquisition [Line Items]      
Equity interests issued and issuable $ 2.3