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Municipal Bond Guarantee Insurance - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	Aug. 06, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jul. 01, 2024 USD ($)
Guarantor Obligations [Line Items]
Member surplus contributions, insurance premium charges, percentage		55.00%		55.00%
Premiums written, gross			$ 13.6		$ 24.1
Gross earned premiums			9.0		16.8
Assets held-in-trust		$ 984.1		$ 984.1		$ 950.1
Collateral trusts, investments and cash		299.4		299.4		289.4
Surplus notes		300.9		300.9		300.9
Interest receivable		7.5		7.5		7.7
Debt		694.6		694.6		562.5
Interest income from BAM Surplus Notes		7.5	0.0	15.0	0.0
Operating Segments \| Financial Guarantee (HG Global)
Guarantor Obligations [Line Items]
Debt		147.6		147.6		147.4
Interest income from BAM Surplus Notes		7.5	0.0	15.0	0.0
Notes receivable, fair value disclosure		396.7		396.7		381.7	$ 387.4
BAM Surplus Notes
Guarantor Obligations [Line Items]
Distribution received		22.2	$ 6.0	22.2	$ 32.3
Surplus notes distribution received		15.2		15.2
Cash distribution received		7.0		$ 7.0
BAM Surplus Notes \| Surplus Notes
Guarantor Obligations [Line Items]
Basis spread on variable rate				3.00%
Stated margin			8.20%		8.20%		10.00%
Repayments of the BAM Surplus Notes subsequent to the deconsolidation of BAM			$ 8.0		$ 8.0
Repayment of principal					5.1
Accrued interest payment held in trust			0.3		0.3
Accrued interest payment held outside of trust			$ 2.6		$ 2.6
Debt		300.9		$ 300.9		300.9
Interest receivable		$ 209.8		$ 209.8		$ 194.8
BAM Surplus Notes \| Surplus Notes \| Subsequent Event
Guarantor Obligations [Line Items]
Repayments of the BAM Surplus Notes subsequent to the deconsolidation of BAM	$ 8.0
BAM Surplus Notes \| Surplus Notes \| Discount Rate
Guarantor Obligations [Line Items]
Debt instrument, measurement input		0.0800		0.0800		0.0810
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
Premiums written, gross		$ 19.2		$ 25.9
Gross earned premiums		7.1		$ 15.3
Percent over a target trust balance				102.00%
Subsidiary - HG Global \| Regulation 114
Guarantor Obligations [Line Items]
Assets held-in-trust		376.3		$ 376.3		$ 352.1
Supplement trust target		603.0		603.0
Subsidiary - HG Global \| Supplemental Trust
Guarantor Obligations [Line Items]
Assets held-in-trust		$ 607.8		$ 607.8		$ 598.0
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