v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Jul. 31, 2026
Entity Listings [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-31978  
Entity Registrant Name Assurant, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 39-1126612  
Entity Address, Address Line One 260 Interstate North Circle SE  
Entity Address, City or Town Atlanta  
Entity Address, State or Province GA  
Entity Address, Postal Zip Code 30339  
City Area Code 770  
Local Phone Number 763-1000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   49,323,767
Entity Central Index Key 0001267238  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Stock, $0.01 Par Value    
Entity Listings [Line Items]    
Title of 12(b) Security Common Stock, $0.01 Par Value  
Trading Symbol AIZ  
Security Exchange Name NYSE  
5.25% Subordinated Notes due 2061    
Entity Listings [Line Items]    
Title of 12(b) Security 5.25% Subordinated Notes due 2061  
Trading Symbol AIZN  
Security Exchange Name NYSE