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Information About Segments of Business Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting, Asset Reconciling Item    
Assets $ 17,110.5 $ 16,988.1
General Insurance Group [Member]    
Segment Reporting, Asset Reconciling Item    
Assets 14,523.0 14,251.8
Title Insurance Group [Member]    
Segment Reporting, Asset Reconciling Item    
Assets 1,314.3 1,243.0
RFIG Run-off Business [Member]    
Segment Reporting, Asset Reconciling Item    
Assets 978.7 1,108.4
Total of major segments [Member]    
Segment Reporting, Asset Reconciling Item    
Assets 16,816.1 16,603.3
All Other Segments [Member]    
Segment Reporting, Asset Reconciling Item    
Assets [1] 769.4 833.9
Business Intersegment, Eliminations [Member]    
Segment Reporting, Asset Reconciling Item    
Assets $ (475.0) $ (449.1)
[1] Represents amounts for Old Republic's holding company parent, minor corporate services subsidiaries, and a small life and accident insurance operation.