| Document and Entity Information | Aug. 11, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001788882 |
| Document Type | 8-K |
| Document Period End Date | Aug. 11, 2021 |
| Entity Registrant Name | ROOT, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39658 |
| Entity Tax Identification Number | 84-2717903 |
| Entity Address, Address Line One | 80 E. Rich Street |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Columbus |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 43215 |
| City Area Code | (866) |
| Local Phone Number | 980-9431 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, $0.0001 par value |
| Trading Symbol | ROOT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
