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Postretirement Benefits - Schedule of Information Regarding the SERP (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Retirement Benefits [Abstract] |  |  |
Premiums paid for insurance coverage | $ 0 | $ 443 |
Total investments: |  |  |
COLI | 58,505 |  | $ 57,210
Exchange traded funds | 107,804 |  | 98,314
Total investments of SERP | $ 166,309 |  | $ 155,524

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- Definition Insurance Cash Value And Investment Fund Supporting Supplemental Pension Plan Liability + References No definition available. + Details
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Namespace Prefix: | gl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurance Cash Value And Investment Fund Supporting Supplemental Pension Plan Liability + References No definition available. + Details
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Namespace Prefix: | gl_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Insurance cash value included in the assets of the supplemental pension plan. + References No definition available. + Details
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Namespace Prefix: | gl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurance premium added to the policy value in the supplemental retirement plan. + References No definition available. + Details
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Namespace Prefix: | gl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Investment In Investment Fund + References No definition available. + Details
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Namespace Prefix: | gl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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