INVESTMENTS - Special Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized costs of special deposits	$ 11.7	$ 13.4
Fair of special deposits	$ 11.3	$ 13.8

Regulatory Asset Requirement, Special Deposits, Amortized Cost

No definition available.

Name:	root_RegulatoryAssetRequirementSpecialDepositsAmortizedCost
Namespace Prefix:	root_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant