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Catastrophe Reinsurance - Coverage for Catastrophe Reinsurance (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property & Casualty Insurance Subsidiaries | Retained |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, reinsured risk, percentage | 0.00% | 0.00% | 0.00%
Property & Casualty Insurance Subsidiaries | 1st Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, percentage | 95.00% | 95.00% | 95.00%
Property & Casualty Insurance Subsidiaries | 2nd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, percentage | 95.00% |  |
Property & Casualty Insurance Subsidiaries | 2nd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, percentage |  | 95.00% | 63.30%
Property & Casualty Insurance Subsidiaries | 3rd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, percentage |  | 95.00% | 31.70%
Property & Casualty Insurance Subsidiaries | Minimum |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, amount retained | $ 0 | $ 0 |
Reinsurance retention policy, excess retention, amount reinsured | 60,000,000.0 | 60,000,000.0 |
Property & Casualty Insurance Subsidiaries | Minimum | Retained |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, amount retained | 0 | 0 | $ 0
Property & Casualty Insurance Subsidiaries | Minimum | 1st Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured | 50,000,000.0 | 50,000,000.0 | 50,000,000.0
Property & Casualty Insurance Subsidiaries | Minimum | 2nd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured | 150,000,000.0 |  |
Property & Casualty Insurance Subsidiaries | Minimum | 2nd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured |  | 150,000,000.0 | 150,000,000.0
Property & Casualty Insurance Subsidiaries | Minimum | 3rd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured |  | 250,000,000.0 | 150,000,000.0
Property & Casualty Insurance Subsidiaries | Maximum |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, amount retained | 60,000,000.0 | 60,000,000.0 |
Reinsurance retention policy, excess retention, amount reinsured | 110,000,000.0 | 110,000,000.0 |
Property & Casualty Insurance Subsidiaries | Maximum | Retained |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, amount retained | 50,000,000.0 | 50,000,000.0 | 50,000,000.0
Property & Casualty Insurance Subsidiaries | Maximum | 1st Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured | 150,000,000.0 | 150,000,000.0 | 150,000,000.0
Property & Casualty Insurance Subsidiaries | Maximum | 2nd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured | $ 250,000,000.0 |  |
Property & Casualty Insurance Subsidiaries | Maximum | 2nd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured |  | 250,000,000.0 | 250,000,000.0
Property & Casualty Insurance Subsidiaries | Maximum | 3rd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured |  | $ 275,000,000.0 | $ 350,000,000.0
Kemper Preferred, Kemper Specialty and Kemper Direct Segments | 3rd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, percentage | 95.00% |  |
Kemper Preferred, Kemper Specialty and Kemper Direct Segments | Minimum | 3rd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured | $ 250,000,000.0 |  |
Kemper Preferred, Kemper Specialty and Kemper Direct Segments | Maximum | 3rd Layer of Coverage |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Reinsurance retention policy, excess retention, amount reinsured | $ 275,000,000.0 |  |

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