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Schedule 2 - Parent Company Financial Statements - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2022 USD ($) deferral_period | Jun. 30, 2017 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 01, 2022 USD ($) | Feb. 15, 2022 USD ($) | Sep. 22, 2020 | Feb. 28, 2015 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations |  |  | $ 40,000,000 |  |  |  |  |
Long-term Debt |  |  | 1,391,600,000 | $ 1,389,200,000 |  |  |  |
Gain on derivative |  |  | $ 5,900,000 |  |  |  |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | (Loss) Gain on Cash Flow Hedges |  |  |  |  |
Amortization |  |  | $ 600,000 |  |  |  |  |
Net gain on derivative instrument |  |  | $ 500,000 |  |  |  |  |
Senior Notes, 4.35 Percent Due February 15, 2025 | Senior Notes |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Stated interest rate, percentage |  |  | 4.35% |  |  |  |  |
Long-term debt, gross |  |  | $ 450,000,000.0 |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 250,000,000.0
Increase in debt instrument |  | $ 200,000,000.0 |  |  |  |  |  |
Long-term Debt |  |  | 0 | 449,600,000 |  |  |  |
Senior Notes, 2.400 Percent Due September 30, 2030 | Senior Notes |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Stated interest rate, percentage |  |  |  |  |  |  | 2.40% |
Long-term debt, gross |  |  | 400,000,000.0 |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  | 395,800,000 |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  | 2.52% |
Long-term Debt |  |  | 397,500,000 | 397,000,000.0 |  |  |  |
Senior Notes, 3.800 Percent Due February 23, 2032 |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  | $ 395,100,000 |  |
Senior Notes, 3.800 Percent Due February 23, 2032 | Senior Notes |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Stated interest rate, percentage |  |  |  |  |  | 3.80% |  |
Long-term debt, gross |  |  | 400,000,000 |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  | 3.95% |
Long-term Debt |  |  | 396,500,000 | 396,000,000.0 |  |  |  |
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Long-term Debt | $ 144,700,000 |  |  |  |  |  |  |
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 | Senior Notes |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | 150,000,000 |  |  |  |  |
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 | Junior Debt |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Stated interest rate, percentage | 5.875% |  |  |  |  |  |  |
Long-term Debt |  |  | 147,700,000 | 146,600,000 |  |  |  |
Debt instrument, basis spread on variable rate | 4.14% |  |  |  |  |  |  |
Interest deferrals, number of deferral periods | deferral_period | 1 |  |  |  |  |  |  |
Interest deferrals, period (up to) | 5 years |  |  |  |  |  |  |
Subsidiary of Common Parent | Non-cash Dividends |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  | 0 | 385,600,000 |  |  |  |
Parent Company | Non-cash Capital Contributions |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  | $ 0 | $ 336,500,000 |  |  |  |
Kemper Bermuda Ltd |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Guarantor obligations |  |  |  |  | $ 300,000,000 |  |  |

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