CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Cash Flows from Operating Activities
Net Income	$ (419.7)	$ 39.7	$ 69.2	$ 564.4
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables			514.0	521.2
Deferred Policy Acquisition Cost			(152.4)	(131.1)
Change in Insurance Liabilities			144.8	484.5
Change in Income Taxes			(38.1)	19.0
Change in Other Accrued Liabilities			7.6	(143.1)
Non-cash Components of Net Investment Income			(312.4)	(299.7)
Gain (Loss) on Investments	(853.0)	128.0	(863.2)	(96.5)
Depreciation			116.5	91.8
Cash Related to Reinsurance Agreement			0.0	953.5
Amortization of Deferred Loss on Reinsurance			137.2	67.9
Amortization of Deferred Gain on Reinsurance			12.7	4.6
Other, Net			68.9	16.5
Net Cash Provided by Operating Activities			1,405.8	329.8
Cash Flows from Investing Activities
Proceeds from Sale of Debt Securities, Available-for-sale			528.2	673.1
Proceeds from Maturities of Fixed Maturity Securities			1,873.1	1,506.7
Proceeds from Sales and Maturities of Other Investments			597.1	375.3
Payments to Acquire Debt Securities, Available-for-sale			(4,603.9)	(1,747.2)
Purchases of Other Investments			(553.8)	(281.9)
Net Sales and Maturities of Short-term Investments			1,343.2	33.5
Net Increase (Decrease) in Payables for Collateral on Investments			(335.5)	306.4
Net Purchases of Property and Equipment			(100.7)	(94.5)
Net Cash Provided (Used) by Investing Activities			(1,252.3)	771.4
Cash Flows from Financing Activities
Repayments of Long-term Debt			7.2	0.0
Issuance of Common Stock			4.6	4.3
Repurchase of Common Stock			(807.2)	(751.8)
Dividends Paid to Stockholders			(231.8)	(228.9)
Proceeds from Policyholder Account Deposits			2,979.3	93.6
Payments for Policyholder Account Withdrawals			(1,965.2)	(68.8)
Cash Received Related to Active Life Volatility Cover Agreement			12.4	17.4
Other, Net			(16.7)	(1.9)
Net Cash Used by Financing Activities			(31.8)	(936.1)
Net Increase (Decrease) in Cash and Bank Deposits			121.7	165.1
Cash and Bank Deposits at Beginning of Year			158.2	162.8	$ 162.8
Cash and Bank Deposits at End of Period	$ 279.9	$ 327.9	$ 279.9	$ 327.9	$ 158.2