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Municipal Bond Guarantee Reinsurance - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Jul. 01, 2024	Jun. 30, 2024
Guarantor Obligations [Line Items]
Member surplus contributions, insurance premium charges, percentage	55.00%		55.00%
Assets held-in-trust	$ 1,013.7		$ 1,013.7		$ 1,006.5
Collateral trusts, investments and cash	320.7		320.7		323.3
Surplus notes	276.8		276.8		276.8
Interest receivable	6.9		6.9		7.0
Debt	932.5		932.5		837.0
Interest income from BAM Surplus Notes	6.9	$ 7.5	13.8	$ 15.0
BAM Surplus Notes
Guarantor Obligations [Line Items]
Distribution received	13.8	22.2	28.8	22.2
Accrued interest	6.9	15.2	14.0	15.2
Cash distribution received	6.9	7.0	$ 14.8	7.0
BAM Surplus Notes \| Surplus Notes
Guarantor Obligations [Line Items]
Basis spread on variable rate			3.00%
Stated margin						10.00%	8.20%
Debt	276.8		$ 276.8		276.8
Interest receivable	$ 227.5		$ 227.5		$ 213.7
BAM Surplus Notes \| Surplus Notes \| Discount Rate
Guarantor Obligations [Line Items]
Debt instrument, measurement input	0.0820		0.0820		0.0805
HG Global
Guarantor Obligations [Line Items]
Premiums written, gross	$ 11.0	19.2	$ 19.3	25.9
Gross earned premiums	7.7	7.1	15.4	15.3
HG Global \| Operating Segments
Guarantor Obligations [Line Items]
Debt	197.4		197.4		$ 147.8
Interest income from BAM Surplus Notes	6.9	7.5	13.8	15.0
Notes receivable, fair value disclosure	$ 352.8	$ 396.7	352.8	$ 396.7	339.0
Subsidiary - HG Global
Guarantor Obligations [Line Items]
Purchase of surplus notes			$ 503.0
Percentage of risk premium ceded	60.00%		60.00%
Renegotiation period			5 years
Percent over a target trust balance			102.00%
Subsidiary - HG Global \| Regulation 114
Guarantor Obligations [Line Items]
Assets held-in-trust	$ 409.3		$ 409.3		399.4
Supplement trust target	603.0		603.0
Subsidiary - HG Global \| Supplemental Trust
Guarantor Obligations [Line Items]
Assets held-in-trust	$ 604.4		$ 604.4		$ 607.1
Subsidiary - HG Global \| Maximum
Guarantor Obligations [Line Items]
Percentage of par value of policy reinsured	15.00%		15.00%
Variable Interest Entity, Primary Beneficiary - Build America Mutual Assurance Company \| Fidus Re Ltd.
Guarantor Obligations [Line Items]
Reinsured amount			$ 125.0