| Cover | Feb. 25, 2021 | Dec. 01, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Feb. 25, 2021 | |
| Entity Registrant Name | ROOT, INC. | |
| Entity Incorporation, State or 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 | |
| Title of 12(b) Security | 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 | |
| Entity Central Index Key | 0001788882 | |
| Amendment Flag | false |
