Long-Duration Insurance Contracts - Balances of and Changes in the LFPB (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Mar. 31, 2026	Dec. 31, 2024
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 1,586.5	$ 1,586.5	$ 1,611.5
Whole Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	222.2	239.5	229.1
Beginning balance at original discount rate	252.4	270.6	263.2
Change in cash flow assumptions			0.0	$ 0.0	$ 6.3
Actual variances from expected experience			(1.3)	(0.4)	0.3
Adjusted balance			269.3	252.0	269.8
Issuances	2.8	5.3	10.7
Interest accruals	2.1	4.3	8.4
Net premiums collected	(6.2)	(28.1)	(18.3)
Ending balance at original discount rate	250.8	250.8	270.6
Effect of changes in discount rate assumptions	(29.4)	(29.4)	(31.1)
Ending balance	221.4	221.4	239.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	496.8	518.4	504.3
Beginning balance at original discount rate	616.5	616.5	631.9	615.8	617.4
Changes in cash flow assumptions			0.0	0.0	5.9
Actual variances from expected experience			(1.3)	(0.5)	1.0
Adjusted balance			630.6	615.3	624.3
Issuances	2.8	5.3	10.7
Interest accruals	5.4	10.8	21.0
Benefit payments	(7.0)	(30.2)	(24.1)
Ending balance at original discount rate	616.5	616.5	631.9
Effect of changes in discount rate assumptions	(114.8)	(114.8)	(113.5)
Ending balance	501.7	501.7	518.4
Net liability for future policy benefits	280.3	280.3	278.8
Less: Reinsurance recoverable	(56.8)	(56.8)	(57.3)
Net liability for future policy benefits, after reinsurance recoverable	223.5	223.5	221.5
Impact of flooring on net liability for future policy benefits	0.0	0.0	0.0
Net liability for future policy benefits	223.5	223.5	221.5
Term Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	242.8	245.2	245.9
Beginning balance at original discount rate	259.9	259.7	271.2
Change in cash flow assumptions			0.0	0.0	(16.5)
Actual variances from expected experience			(1.4)	(0.1)	(3.4)
Adjusted balance			258.3	259.8	251.3
Issuances	5.5	10.3	23.6
Interest accruals	2.8	5.6	11.1
Net premiums collected	(6.8)	(12.9)	(26.3)
Ending balance at original discount rate	261.3	261.3	259.7
Effect of changes in discount rate assumptions	(16.8)	(16.8)	(14.5)
Ending balance	244.5	244.5	245.2
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	386.0	389.3	377.8
Beginning balance at original discount rate	437.4	437.4	429.8	432.5	433.2
Changes in cash flow assumptions			0.0	0.0	(20.7)
Actual variances from expected experience			(0.9)	0.0	(4.4)
Adjusted balance			428.9	432.5	408.1
Issuances	5.6	10.5	23.8
Interest accruals	4.5	8.8	17.0
Benefit payments	(5.2)	(10.8)	(19.1)
Ending balance at original discount rate	437.4	437.4	429.8
Effect of changes in discount rate assumptions	(44.4)	(44.4)	(40.4)
Ending balance	393.0	393.0	389.3
Net liability for future policy benefits	148.4	148.4	144.1
Less: Reinsurance recoverable	(21.3)	(21.3)	(20.9)
Net liability for future policy benefits, after reinsurance recoverable	127.1	127.1	123.2
Impact of flooring on net liability for future policy benefits	0.0	0.0	0.0
Net liability for future policy benefits	127.1	127.1	123.2
Experience life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	64.6	67.1	66.6
Beginning balance at original discount rate	63.2	64.5	65.4
Change in cash flow assumptions			0.0	0.0	0.7
Actual variances from expected experience			(1.3)	(0.8)	1.6
Adjusted balance			63.2	62.4	67.7
Issuances	0.0	0.0	0.0
Interest accruals	0.9	1.8	3.7
Net premiums collected	(1.7)	(3.4)	(6.9)
Ending balance at original discount rate	61.6	61.6	64.5
Effect of changes in discount rate assumptions	1.4	1.4	2.6
Ending balance	63.0	63.0	67.1
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	786.0	807.8	813.2
Beginning balance at original discount rate	750.9	750.9	763.3	757.1	782.8
Changes in cash flow assumptions			0.0	0.0	1.7
Actual variances from expected experience			(1.8)	(1.2)	3.4
Adjusted balance			761.5	755.9	787.9
Issuances	0.0	0.0	0.0
Interest accruals	11.1	22.4	45.7
Benefit payments	(16.1)	(33.0)	(70.3)
Ending balance at original discount rate	750.9	750.9	763.3
Effect of changes in discount rate assumptions	30.0	30.0	44.5
Ending balance	780.9	780.9	807.8
Net liability for future policy benefits	718.0	718.0	740.8
Less: Reinsurance recoverable	(0.8)	(0.8)	(0.8)
Net liability for future policy benefits, after reinsurance recoverable	717.2	717.2	740.0
Impact of flooring on net liability for future policy benefits	0.0	0.0	0.0
Net liability for future policy benefits	717.2	717.2	740.0
Limited-Pay Whole Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	34.0	35.0	34.2
Beginning balance at original discount rate	35.9	36.5	36.8
Change in cash flow assumptions			0.0	0.0	0.4
Actual variances from expected experience			(0.4)	0.0	(0.2)
Adjusted balance			36.1	35.9	37.0
Issuances	0.5	1.0	2.5
Interest accruals	0.3	0.7	1.5
Net premiums collected	(1.2)	(2.2)	(4.5)
Ending balance at original discount rate	35.6	35.6	36.5
Effect of changes in discount rate assumptions	(1.9)	(1.9)	(1.5)
Ending balance	33.7	33.7	35.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	88.1	89.6	86.2
Beginning balance at original discount rate	119.3	119.3	118.1	118.5	114.3
Changes in cash flow assumptions			0.0	0.0	0.2
Actual variances from expected experience			(0.4)	0.1	0.0
Adjusted balance			117.7	118.6	114.5
Issuances	0.5	1.0	2.5
Interest accruals	1.1	2.3	4.5
Benefit payments	(0.9)	(1.7)	(3.4)
Ending balance at original discount rate	119.3	119.3	118.1
Effect of changes in discount rate assumptions	(29.5)	(29.5)	(28.5)
Ending balance	89.8	89.8	89.6
Net liability for future policy benefits	56.0	56.0	54.6
Less: Reinsurance recoverable	(1.5)	(1.5)	(1.4)
Net liability for future policy benefits, after reinsurance recoverable	54.5	54.5	53.2
Impact of flooring on net liability for future policy benefits	0.0	0.0	0.0
Net liability for future policy benefits	54.5	54.5	53.2
Supplemental health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	187.2	187.5	179.9
Beginning balance at original discount rate	215.7	213.6	214.6
Change in cash flow assumptions			0.0	0.0	(2.8)
Actual variances from expected experience			3.1	1.4	(2.4)
Adjusted balance			216.7	217.1	209.4
Issuances	4.7	10.1	22.9
Interest accruals	1.8	3.5	7.0
Net premiums collected	(6.9)	(13.7)	(25.7)
Ending balance at original discount rate	216.6	216.6	213.6
Effect of changes in discount rate assumptions	(27.6)	(27.6)	(26.1)
Ending balance	189.0	189.0	187.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	375.0	379.0	383.4
Beginning balance at original discount rate	464.3	464.3	462.7	463.9	482.8
Changes in cash flow assumptions			0.0	0.0	(5.3)
Actual variances from expected experience			2.8	1.3	(4.7)
Adjusted balance			465.5	465.2	472.8
Issuances	4.7	10.1	22.9
Interest accruals	3.5	6.9	13.9
Benefit payments	(9.1)	(18.2)	(46.9)
Ending balance at original discount rate	464.3	464.3	462.7
Effect of changes in discount rate assumptions	(86.7)	(86.7)	(83.7)
Ending balance	377.6	377.6	379.0
Net liability for future policy benefits	188.9	188.9	191.8
Less: Reinsurance recoverable	(5.1)	(5.1)	(5.1)
Net liability for future policy benefits, after reinsurance recoverable	183.8	183.8	186.7
Impact of flooring on net liability for future policy benefits	0.0	0.0	0.0
Net liability for future policy benefits	183.8	183.8	186.7
Cancer
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	64.7	64.7	66.0
Accident
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	17.2	17.2	17.9
Disability
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	21.0	21.0	21.3
Other
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	80.9	80.9	81.5
SPIA (life contingent)
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	0.0	0.0	0.0
Beginning balance at original discount rate	0.0	0.0	0.0
Change in cash flow assumptions			0.0	0.0	0.0
Actual variances from expected experience			0.0	0.0	0.0
Adjusted balance			0.0	0.0	0.0
Issuances	0.0	0.2	2.4
Interest accruals	0.0	0.0	0.0
Net premiums collected	0.0	(0.2)	(2.4)
Ending balance at original discount rate	0.0	0.0	0.0
Effect of changes in discount rate assumptions	0.0	0.0	0.0
Ending balance	0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	93.4	96.0	97.3
Beginning balance at original discount rate	99.7	99.7	103.0	101.7	107.3
Changes in cash flow assumptions			0.0	0.0	0.0
Actual variances from expected experience			(0.3)	(0.1)	0.1
Adjusted balance			102.7	$ 101.6	$ 107.4
Issuances	0.0	0.2	2.4
Interest accruals	1.0	2.0	4.1
Benefit payments	(2.9)	(5.2)	(10.9)
Ending balance at original discount rate	99.7	99.7	103.0
Effect of changes in discount rate assumptions	(8.2)	(8.2)	(7.0)
Ending balance	91.5	91.5	96.0
Net liability for future policy benefits	91.6	91.6	96.0
Less: Reinsurance recoverable	(4.1)	(4.1)	(3.8)
Net liability for future policy benefits, after reinsurance recoverable	87.5	87.5	92.2
Impact of flooring on net liability for future policy benefits	0.0	0.0	0.0
Net liability for future policy benefits	$ 87.5	$ 87.5	$ 92.2

Liability For Future Policy Benefit, Adjustment Due To Reserve Flooring

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- Definition

Liability For Future Policy Benefit, After Reinsurance, Before Impact Of Flooring

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No definition available.

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate.

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Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from increase (decrease) in expected net premium component of liability for future policy benefit from change in discount rate.

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Amount, after effect of reinsurance, of liability for future policy benefit.

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Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected future benefit and expense component for liability for future policy benefit, discounted at original rate.

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Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected future policy benefit and expense component of liability for future policy benefit.

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Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows.

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Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from effect of variance from cash flow assumption change for actual experience.

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Amount of interest expense for expected future policy benefit and expense component of liability for future policy benefit.

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Amount of increase in expected future policy benefit and expense component of liability for future policy benefit from contract issuance.

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- Definition

Amount, before effect of reinsurance and current period update of cash flow assumption, of expected future policy benefit and expense component of liability for future policy benefit, discounted at original rate.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected net premium component of liability for future policy benefit.

+ References

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- Definition

Amount of cumulative increase (decrease) in expected net premium component of liability for future policy benefit from cash flow assumption change for future cash flows.

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