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Fair Value Disclosures (Tables) | 3 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Schedule of Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present the Company’s fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of March 31, 2026 and December 31, 2025. The amounts presented below for short-term investments, other investments, cash equivalents, other assets and other liabilities differ from the amounts presented in the consolidated balance sheets because only certain investments or certain assets and liabilities within these line items are measured at estimated fair value. Other investments are comprised of investments in the Assurant Investment Plan (“AIP”), the American Security Insurance Company Investment Plan, the Assurant Deferred Compensation Plan, the Retiree Medical Pension 401(h), and other derivatives. Other liabilities are comprised of investments in the AIP and contingent considerations related to business combinations. The fair value amounts presented for other investments are received directly from third parties.
| March 31, 2026 |
| Total |  | Level 1 |  | Level 2 |  | Level 3 |
Financial Assets |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |
U.S. government and government agencies and authorities | $ | 63.1 |  |  | $ | — |  |  | $ | 63.1 |  |  | $ | — |  |
States, municipalities and political subdivisions | 94.8 |  |  | — |  |  | 94.8 |  |  | — |  |
Foreign governments | 615.0 |  |  | — |  |  | 615.0 |  |  | — |  |
Asset-backed | 850.1 |  |  | — |  |  | 713.4 |  |  | 136.7 |  |
Commercial mortgage-backed | 419.0 |  |  | — |  |  | 419.0 |  |  | — |  |
Residential mortgage-backed | 1,001.5 |  |  | — |  |  | 1,001.5 |  |  | — |  |
U.S. corporate | 3,970.5 |  |  | — |  |  | 3,897.8 |  |  | 72.7 |  |
Foreign corporate | 1,769.8 |  |  | — |  |  | 1,756.3 |  |  | 13.5 |  |
Equity securities: |  |  |  |  |  |  |  |
Mutual funds | 37.9 |  |  | 16.3 |  |  | — |  |  | 21.6 |  |
Common stocks | 2.2 |  |  | 2.2 |  |  | — |  |  | — |  |
Non-redeemable preferred stocks | 157.2 |  |  | — |  |  | 156.8 |  |  | 0.4 |  |
Short-term investments | 278.0 |  |  | 269.8 |  | (2) | 8.2 |  | (3) | — |  |
Other investments | 69.5 |  |  | 69.5 |  | (1) | — |  |  | — |  |
Cash equivalents | 1,156.7 |  |  | 1,141.9 |  | (2) | 14.8 |  | (3) | — |  |
Other assets | 5.0 |  |  | — |  |  | — |  |  | 5.0 |  | (4)
Total financial assets | $ | 10,490.3 |  |  | $ | 1,499.7 |  |  | $ | 8,740.7 |  |  | $ | 249.9 |  |
Financial Liabilities |  |  |  |  |  |  |  |
Other liabilities | $ | 93.6 |  |  | $ | 61.9 |  | (1) | $ | — |  |  | $ | 31.7 |  | (5)
Total financial liabilities | $ | 93.6 |  |  | $ | 61.9 |  |  | $ | — |  |  | $ | 31.7 |  |
| December 31, 2025 |
| Total |  | Level 1 |  | Level 2 |  | Level 3 |
Financial Assets |  |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |  |
U.S. government and government agencies and authorities | $ | 62.9 |  |  | $ | — |  |  | $ | 62.9 |  |  | $ | — |  |
States, municipalities and political subdivisions | 96.1 |  |  | — |  |  | 96.1 |  |  | — |  |
Foreign governments | 593.9 |  |  | — |  |  | 593.9 |  |  | — |  |
Asset-backed | 845.7 |  |  | — |  |  | 715.9 |  |  | 129.8 |  |
Commercial mortgage-backed | 417.4 |  |  | — |  |  | 417.4 |  |  | — |  |
Residential mortgage-backed | 954.7 |  |  | — |  |  | 954.7 |  |  | — |  |
U.S. corporate | 3,877.6 |  |  | — |  |  | 3,812.0 |  |  | 65.6 |  |
Foreign corporate | 1,729.4 |  |  | — |  |  | 1,721.5 |  |  | 7.9 |  |
Equity securities: |  |  |  |  |  |  |  |
Mutual funds | 37.3 |  |  | 16.1 |  |  | — |  |  | 21.2 |  |
Common stocks | 2.0 |  |  | 2.0 |  |  | — |  |  | — |  |
Non-redeemable preferred stocks | 167.8 |  |  | — |  |  | 167.5 |  |  | 0.3 |  |
Short-term investments | 336.3 |  |  | 329.0 |  | (2) | 7.3 |  | (3) | — |  |
Other investments | 72.2 |  |  | 72.2 |  | (1) | — |  |  | — |  |
Cash equivalents | 1,349.3 |  |  | 1,335.5 |  | (2) | 13.8 |  | (3) | — |  |
Other assets | 6.4 |  |  | — |  |  | — |  |  | 6.4 |  | (4)
Total financial assets | $ | 10,549.0 |  |  | $ | 1,754.8 |  |  | $ | 8,563.0 |  |  | $ | 231.2 |  |
Financial Liabilities |  |  |  |  |  |  |  |
Other liabilities | $ | 85.0 |  |  | $ | 62.7 |  | (1) | $ | — |  |  | $ | 22.3 |  | (5)
Total financial liabilities | $ | 85.0 |  |  | $ | 62.7 |  |  | $ | — |  |  | $ | 22.3 |  |
(1)Primarily includes mutual funds and related obligations. (2)Primarily includes money market funds. (3)Primarily includes fixed maturity securities. (4)Primarily includes derivatives. (5)Includes contingent consideration liabilities.
Schedule of Carrying Value and Fair Value of the Financial Instruments That are Not Recognized or are Not Carried at Fair Value | The following tables disclose the carrying value, fair value and hierarchy level of the financial instruments that are not recognized or are not carried at fair value in the consolidated balance sheets as of the dates indicated:
| March 31, 2026
|  |  | Fair Value
| Carrying Value |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Financial Assets |  |  |  |  |  |  |  |  |
Commercial mortgage loans on real estate | $ | 309.5 |  |  | $ | 306.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 306.0 |
Other investments | 12.3 |  |  | 12.3 |  |  | 1.1 |  |  | — |  |  | 11.2 |
Other assets | 27.1 |  |  | 27.1 |  |  | — |  |  | — |  |  | 27.1 |
Total financial assets | $ | 348.9 |  |  | $ | 345.4 |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 344.3 |
Financial Liabilities |  |  |  |  |  |  |  |  |
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 1.7 |
Funds withheld under reinsurance | 287.1 |  |  | 287.1 |  |  | 287.1 |  |  | — |  |  | — |
Debt | 2,207.5 |  |  | 2,143.0 |  |  | — |  |  | 2,143.0 |  |  | — |
Total financial liabilities | $ | 2,496.4 |  |  | $ | 2,431.8 |  |  | $ | 287.1 |  |  | $ | 2,143.0 |  |  | $ | 1.7 |
| December 31, 2025
|  |  | Fair Value
| Carrying Value |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Financial Assets |  |  |  |  |  |  |  |  |
Commercial mortgage loans on real estate | $ | 324.7 |  |  | $ | 323.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 323.1 |
Other investments | 12.4 |  |  | 12.4 |  |  | 1.1 |  |  | — |  |  | 11.3 |
Other assets | 31.3 |  |  | 31.3 |  |  | — |  |  | — |  |  | 31.3 |
Total financial assets | $ | 368.4 |  |  | $ | 366.8 |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 365.7 |
Financial Liabilities |  |  |  |  |  |  |  |  |
Policy reserves under investment products (Individual and group annuities, subject to discretionary withdrawal) (1) | $ | 1.8 |  |  | $ | 1.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 1.8 |
Funds withheld under reinsurance | 266.4 |  |  | 266.4 |  |  | 266.4 |  |  | — |  |  | — |
Debt | 2,206.9 |  |  | 2,164.5 |  |  | — |  |  | 2,164.5 |  |  | — |
Total financial liabilities | $ | 2,475.1 |  |  | $ | 2,432.7 |  |  | $ | 266.4 |  |  | $ | 2,164.5 |  |  | $ | 1.8 |
(1)Only the fair value of the Company’s policy reserves for investment-type contracts (those without significant mortality or morbidity risk) are reflected in the tables above.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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