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Income Taxes - Narrative (Details) £ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 GBP (£)
Income Tax Reconciliation [Line Items]
Statutory rate of income taxes	21.00%	21.00%	21.00%
Net tax expense related to a pending state income tax examination regarding sale of subsidiary	$ 11,000,000	$ 9,000,000	$ 8,000,000
Net tax expense related to pending IRS settlement regarding the sale of a subsidiary	5,000,000	1,000,000	2,000,000
AFG
Income Tax Reconciliation [Line Items]
Income tax penalties accrued	3,000,000
Unrecognized tax benefits that would impact the effective tax rate		0
AFG | Maximum
Income Tax Reconciliation [Line Items]
Unrecognized tax benefits that would impact the effective tax rate			$ 1,000,000
United Kingdom
Income Tax Reconciliation [Line Items]
Operating loss carryforwards | £				£ 27
Subsidiary 1
Income Tax Reconciliation [Line Items]
Net tax expense related to a pending state income tax examination regarding sale of subsidiary	$ 7,000,000
Subsidiary 2
Income Tax Reconciliation [Line Items]
Net tax expense related to pending IRS settlement regarding the sale of a subsidiary		$ 4,000,000

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