HANOVER INSURANCE GROUP, INC.
COMPANY
10-Q
FORM
2026-10-29
FILING DATE
2026-09-30
Q3 PERIOD END
1833
FACTS
SIC 6331
CIK 0000944695
Taxonomy US GAAP 2026  
SIC 6331
CIK 0000944695
Taxonomy US GAAP 2026  
Standard Concepts
342
Extended Concepts
97
22%
Extended Concepts
Errors
0
What are errors?
What are errors?
Indicate problems with an XBRL formatted filing that are sufficient grounds for SEC rejection of the XBRL portion of the filing.
ERROR
The statement 75020 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Unaudited) includes an inconsistent calculation. The value of the concept us-gaap:OtherComprehensiveIncomeLossNetOfTax of -381,700,000 in the default should be equal to the sum of its child components defined in the calculation linkbase. The sum of these child components is 164,700,000. The values of the addends is determined by adding the values of the child concepts with a decimal value of -5. All valu...
WARNING
The statement 75020 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Unaudited) includes an inconsistent calculation. The value of the concept us-gaap:OtherComprehensiveIncomeLossNetOfTax of -381,700,000 in the default should be equal to the sum of its child components defined in the calculation linkbase. The sum of these child components is 164,700,000. The values of the addends is determined by adding the values of the child concepts with a decimal value of -5. All valu...
What are data quality errors?
What are data quality errors?
Indicate areas that may not meet the standards set by the Data Quality Committee (DQC), and may reveal areas where the XBRL can be improved.