ACQUISITION OF VALIDUS (Details) - Validus Acquisition - USD ($) $ / shares in Units, $ in Millions	Nov. 01, 2023	May 22, 2023
Restructuring Cost and Reserve [Line Items]
Business combination, estimated excess tangible book value threshold for future dividends		$ 2,100.0
Subsequent Event
Restructuring Cost and Reserve [Line Items]
Net purchase price	$ 2,985.0
Cash consideration paid by RenaissanceRe as acquisition consideration	$ 2,735.0
Business acquisition, common shares (in shares)	1,322,541
Value of common shares issued	$ 250.0
Business acquisition, share price ( in dollars per share)	$ 189.03
AIG
Restructuring Cost and Reserve [Line Items]
Business combination, risk reward percentage		95.00%