| Cover Page | Apr. 28, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 28, 2021 |
| Entity Registrant Name | CNO Financial Group, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-31792 |
| Entity Tax Identification Number | 75-3108137 |
| Entity Address, Address Line One | 11825 North Pennsylvania Street |
| Entity Address, City or Town | Carmel |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 46032 |
| City Area Code | 317 |
| Local Phone Number | 817-6100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001224608 |
| Amendment Flag | false |
| Common Stock, par value $0.01 per share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | CNO |
| Security Exchange Name | NYSE |
| Rights to purchase Series E Junior Participating Preferred Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Rights to purchase Series E Junior Participating Preferred Stock |
| No Trading Symbol Flag | true |
| Security Exchange Name | NYSE |
| 5.125% Subordinated Debentures due 2060 | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 5.125% Subordinated Debentures due 2060 |
| Trading Symbol | CNOpA |
| Security Exchange Name | NYSE |
