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Cover Page - USD ($)
12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity Registrant Name OLD REPUBLIC INTERNATIONAL CORPORATION    
Entity Central Index Key 0000074260    
Entity File Number 001-10607    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-2678171    
Entity Address, Address Line One 307 North Michigan Avenue    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60601    
City Area Code 312    
Local Phone Number 346-8100    
Title of 12(b) Security Common Stock / $1 par value    
Trading Symbol ORI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 6,921,960,833
Entity Common Stock, Shares Outstanding   307,601,232  
Documents Incorporated by Reference
The following documents are incorporated by reference into that part of this Form 10-K designated to the right of the document title.
TitlePart
Proxy statement for the 2022 Annual Meeting of Shareholders
Exhibits as specified in exhibit index (page 100)
III, Items 10, 11, 12, 13 and 14
IV, Item 15
   
ICFR Auditor Attestation Flag true