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REINSURANCE - Additional Information (Details)
$ in Millions
Sep. 30, 2022
USD ($)
counterparty
Dec. 31, 2021
USD ($)
counterparty
Effects of Reinsurance [Line Items]    
Funds withheld receivable at interest $ 2,900.0 $ 3,000.0
Number of counterparties | counterparty 6 6
Collateral held on behalf of reinsurers $ 24,300.0 $ 23,400.0
Collateral held on our behalf by reinsurers 1,300.0 1,300.0
Reinsurer collateral, minimum amount held by trusts 59,700.0 55,200.0
Reinsurer collateral, reserves supported by trust assets 61,600.0 55,800.0
Cash Held In Trust    
Effects of Reinsurance [Line Items]    
Restricted cash $ 76.2 $ 149.3