ntageSeniorDebenturesDueTwoThousandTwentyFiveMember

2020-05-12

2020-05-12

id="C_0000944695_us-gaapStatementClassOfStockAxis_thgSixPointThreeFivePercentageSubordinatedDebenturesDueTwoThousandFiftyThreeMember_20200512_20200512">

scheme="http://www.sec.gov/CIK">0000944695

dimension="us-gaap:StatementClassOfStockAxis">thg:SixPointThreeFivePercentageSubordinatedDebenturesDueTwoThousandFiftyThreeMember

2020-05-12

2020-05-12

 

 

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