v3.22.2.2
Cover Page - shares
 9 Months Ended
Sep. 30, 2022
Oct. 28, 2022
Entity Listings [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
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 55 Broadway  
Entity Address, Address Line Two Suite 2901  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10006  
City Area Code 212  
Local Phone Number 859-7000  
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   52,831,429
Entity Central Index Key 0001267238  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
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