CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities
Net Income	$ 953.2	$ 1,118.0
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	455.9	457.9
Deferred Policy Acquisition Cost	(108.8)	(106.1)
Change in Insurance Liabilities	(169.3)	(112.6)
Change in Income Taxes	(26.9)	7.3
Change in Other Accrued Liabilities	(150.2)	(135.0)
Non-cash Components of Net Investment Income	(262.9)	(293.0)
Net Investment Loss	30.0	22.3
Depreciation	80.9	83.5
Amortization of the Cost of Reinsurance	33.1	38.5
Other, Net	24.3	(19.0)
Net Cash Provided by Operating Activities	859.3	1,061.8
Cash Flows from Investing Activities
Proceeds from Sale of Debt Securities, Available-for-sale	1,013.5	453.4
Proceeds from Maturities of Fixed Maturity Securities	1,113.9	1,125.6
Proceeds from Sales and Maturities of Other Investments	275.2	306.4
Payments to Acquire Debt Securities, Available-for-sale	(2,439.4)	(2,380.5)
Purchases of Other Investments	(227.1)	(342.7)
Net Maturities and Sales (Purchases) of Short-term Investments	(45.2)	204.9
Net Increase (Decrease) in Payables for Collateral on Investments	(100.4)	12.5
Net Purchases of Property and Equipment	(89.1)	(70.8)
Net Cash Used by Investing Activities	(498.6)	(691.2)
Cash Flows from Financing Activities
Issuance of Long-term Debt	0.0	349.2
Repayments of Long-term Debt	0.0	364.0
Cost Related to Early Retirement of Debt	0.0	3.6
Issuance of Common Stock	4.1	2.7
Repurchase of Common Stock	(174.2)	(136.1)
Dividends Paid to Stockholders	(205.7)	(188.4)
Proceeds from Policyholder Account Deposits	109.3	90.9
Payments for Policyholder Account Withdrawals	(65.2)	(55.6)
Cash Received Related to Active Life Volatility Cover Agreement	18.6	5.2
Other, Net	(0.9)	(2.6)
Net Cash Used by Financing Activities	(314.0)	(302.3)
Net Increase (Decrease) in Cash and Bank Deposits	46.7	68.3
Cash and Bank Deposits at Beginning of Year	119.2	75.0
Cash and Bank Deposits at End of Period	$ 165.9	$ 143.3