Depositary Share, Ownership Percentage of One Share of Preferred Stock

No definition available.

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Balance Type:	na
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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow to reacquire preferred stock during the period.

+ References

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-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

+ Details

Name:	us-gaap_PaymentsOfDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

+ Details

Name:	us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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Subsequent Events (Details) $ in Millions						3 Months Ended		9 Months Ended
Subsequent Events (Details) $ in Millions	Oct. 29, 2025 USD ($)	Oct. 27, 2025 USD ($)	Oct. 06, 2025 USD ($) shares	Jun. 27, 2025 USD ($)	Feb. 24, 2025	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Aug. 22, 2025 USD ($)
Subsequent Event [Line Items]
Depositary share, ownership percentage of one share of preferred stock					0.001
Redemption of preferred equity								$ 400	$ 0
Payments of dividends								41	22
Subsequent Event
Subsequent Event [Line Items]
Depositary share, ownership percentage of one share of preferred stock			0.001
Series B Preferred Stock
Subsequent Event [Line Items]
Payments of dividends						$ 5	$ 5	$ 15	$ 10
Payments of ordinary dividends, preferred stock and preference stock							$ 5
Series B Preferred Stock \| Subsequent Event
Subsequent Event [Line Items]
Stock redeemed or called during period, shares (in shares) \| shares			12,000
Redemption of preferred equity			$ 303
Payments of dividends			$ 3
Series B Preferred Stock \| Subsequent Event \| Depositary Shares Of Preferred Share
Subsequent Event [Line Items]
Stock repurchased (in shares) \| shares			12,000,000
Term Loan \| Line of Credit
Subsequent Event [Line Items]
Repayments of long-term lines of credit				$ 700
7.000% Fixed-Rate Reset Junior Subordinated Notes - due December 1, 2055 \| Junior Subordinated Debt
Subsequent Event [Line Items]
Debt instrument, face amount										$ 500
7.000% Fixed-Rate Reset Junior Subordinated Notes - due December 1, 2055 \| Junior Subordinated Debt \| Subsequent Event
Subsequent Event [Line Items]
Debt instrument, face amount			$ 500
Argo Group International Holdings, Inc \| Subsequent Event
Subsequent Event [Line Items]
Proceeds from contributions from affiliates		$ 400
Argo Group International Holdings, Inc \| Term Loan \| Line of Credit \| Subsequent Event
Subsequent Event [Line Items]
Repayments of long-term lines of credit	$ 500