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REINSURANCE - Additional Information (Details)
$ in Millions
Sep. 30, 2021
USD ($)
counterparty
Effects of Reinsurance [Line Items]  
Funds withheld receivable at interest $ 3,100.0
Number of counterparties | counterparty 6
Collateral held on behalf of reinsurers $ 23,400.0
Collateral held on our behalf by reinsurers 1,300.0
Reinsurer collateral, minimum amount held by trusts 54,400.0
Reinsurer collateral, reserves supported by trust assets 55,200.0
Cash Held In Trust  
Effects of Reinsurance [Line Items]  
Restricted cash $ 201.7