v3.26.1
Fair Value Measurements (Details) - EBP 002 - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets $ 2,378,392 $ 2,122,600
Assurant, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 50,100 47,200
Fair Value, Inputs, Level 1, Level 2, and Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 2,378,392 2,122,600
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 331,208 382,113
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 136,326 137,506
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Collective investment trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 1,860,713 1,555,759
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Assurant, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 50,145 47,222
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 517,679 566,841
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 331,208 382,113
Level 1 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 136,326 137,506
Level 1 | Collective investment trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 1 | Assurant, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 50,145 47,222
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 1,860,713 1,555,759
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 2 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 2 | Collective investment trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 1,860,713 1,555,759
Level 2 | Assurant, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 3 | Money market funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 3 | Collective investment trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets 0 0
Level 3 | Assurant, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total financial assets $ 0 $ 0