CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash Flows from Operating Activities
Net Income	$ 1,430.4	$ 953.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	566.4	455.9
Deferred Policy Acquisition Cost	(107.4)	(108.8)
Change in Insurance Liabilities	(631.0)	(169.3)
Change in Income Taxes	21.9	(26.9)
Change in Other Accrued Liabilities	(58.3)	(150.2)
Non-cash Components of Net Investment Income	(327.9)	(262.9)
Net Investment Loss	24.5	30.0
Depreciation	89.9	80.9
Amortization of the Cost of Reinsurance	31.1	33.1
Other, Net	(12.2)	24.3
Net Cash Provided by Operating Activities	1,027.4	859.3
Cash Flows from Investing Activities
Proceeds from Sale of Debt Securities, Available-for-sale	356.5	1,013.5
Proceeds from Maturities of Fixed Maturity Securities	997.2	1,113.9
Proceeds from Sales and Maturities of Other Investments	234.8	275.2
Payments to Acquire Debt Securities, Available-for-sale	(1,550.9)	(2,439.4)
Purchases of Other Investments	(218.6)	(227.1)
Net Purchases of Short-term Investments	(307.9)	(45.2)
Net Increase (Decrease) in Payables for Collateral on Investments	189.5	(100.4)
Net Purchases of Property and Equipment	(93.7)	(89.1)
Net Cash Used by Investing Activities	(393.1)	(498.6)
Cash Flows from Financing Activities
Issuance of Long-term Debt	391.6	0.0
Repayments of Long-term Debt	350.0	0.0
Issuance of Common Stock	4.8	4.1
Repurchase of Common Stock	(500.0)	(174.2)
Dividends Paid to Stockholders	(219.3)	(205.7)
Proceeds from Policyholder Account Deposits	100.9	109.3
Payments for Policyholder Account Withdrawals	(65.5)	(65.2)
Cash Received Related to Active Life Volatility Cover Agreement	26.7	18.6
Other, Net	(6.1)	(0.9)
Net Cash Used by Financing Activities	(616.9)	(314.0)
Net Increase (Decrease) in Cash and Bank Deposits	17.4	46.7
Cash and Bank Deposits at Beginning of Year	146.0	119.2
Cash and Bank Deposits at End of Period	$ 163.4	$ 165.9