Reinsurance and Catastrophes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Losses incurred for catastrophe claims, carrying amount		$ 61.7	$ 94.9	$ 97.6
Reinsurance balances receivable		$ 395.0	$ 404.3
Percentage of coverage for catastrophe losses above retention amount, layer one		95.00%
Coverage above retention per occurrence under layer one catastrophe reinsurance		$ 25.0
Retention base amount per occurrence under layer one		$ 35.0
Percentage of coverage for catastrophe losses above retention amount, layer two		95.00%
Coverage above retention per occurrence under layer two catastrophe reinsurance		$ 35.0
Retention base amount per occurrence under layer two		$ 60.0
Percentage of coverage for catastrophe losses above retention amount, layer three		95.00%
Coverage above retention per occurrence under layer three catastrophe reinsurance		$ 90.0
Retention base amount per occurrence under layer three		95.0
Liability coverages, Company reinsured each loss above a retention per occurrence		5.0
Amount of maximum individual life insurance risk retained		$ 0.5
Reinsured risks percentage on a quota share basis of losses for umbrella coverage		50.00%
Percentage of life reinsured catastrophe risk in excess specified retention per occurrence amount		100.00%
Other accidental death and dismemberment risk, ceded, percent		100.00%
Group benefits products, gross assumed group disability and specialty health benefits retained, percent		73.10%
Individual life and annuity benefits, ceded, percent			100.00%
Forecast
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Percentage of coverage for catastrophe losses above retention amount, layer one	95.00%
Coverage above retention per occurrence under layer one catastrophe reinsurance	$ 25.0
Retention base amount per occurrence under layer one	$ 35.0
Percentage of coverage for catastrophe losses above retention amount, layer two	95.00%
Coverage above retention per occurrence under layer two catastrophe reinsurance	$ 35.0
Retention base amount per occurrence under layer two	$ 60.0
Percentage of coverage for catastrophe losses above retention amount, layer three	95.00%
Coverage above retention per occurrence under layer three catastrophe reinsurance	$ 90.0
Retention base amount per occurrence under layer three	$ 95.0
Percentage of coverage for catastrophe losses above retention amount, layer four	95.00%
Coverage above retention per occurrence under layer four catastrophe reinsurance	$ 55.0
Retention base amount per occurrence under layer four	$ 185.0
Reinsured risks percentage on a quota share basis of losses for umbrella coverage	55.00%
National Guardian Life Insurance Company NGL
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Reinsurance balances receivable		$ 167.1
Reinsurance recoverable as a percentage of shareholders' equity, in excess		10.00%
Minimum
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Liability coverages, Company reinsured each loss above a retention per occurrence		$ 20.0
Amount life catastrophe risk retention per occurrence		1.0
Maximum
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Amount life catastrophe risk retention per occurrence		$ 35.0