CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows from Operating Activities
Net Income	$ 358.3	$ 240.4
Adjustments to Reconcile Net Income to Net Cash Provided (Used) by Operating Activities
Change in Receivables	89.9	246.2
Change in Deferred Acquisition Costs	(41.8)	(38.2)
Change in Insurance Reserves and Liabilities	(119.6)	27.5
Change in Income Taxes	76.2	54.4
Change in Other Accrued Liabilities	(175.1)	(127.1)
Non-cash Components of Net Investment Income	(64.4)	(111.3)
Net Investment (Gain) Loss	(0.1)	13.8
Depreciation	26.8	30.0
Amortization of the Cost of Reinsurance	(11.0)	(13.4)
Other, Net	(10.6)	(23.3)
Net Cash Provided (Used) by Operating Activities	150.6	325.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	55.1	171.9
Proceeds from Maturities of Fixed Maturity Securities	387.4	427.1
Proceeds from Sales and Maturities of Other Investments	91.6	102.0
Purchases of Fixed Maturity Securities	(589.1)	(931.9)
Purchases of Other Investments	(79.9)	(128.6)
Net Sales and Maturities of Short-term Investments	183.8	190.2
Net Decrease in Payables for Collateral on Investments	(60.3)	(1.3)
Net Purchases of Property and Equipment	(29.1)	(21.8)
Net Cash Used by Investing Activities	(40.5)	(192.4)
Cash Flows from Financing Activities
Issuance of Common Stock	1.2	0.6
Repurchase of Common Stock	(51.2)	(50.0)
Dividends Paid to Stockholders	(69.2)	(62.0)
Proceeds from Policyholder Account Deposits	37.7	31.2
Payments for Policyholder Account Withdrawals	(24.4)	(21.6)
Other, Net	(0.3)	0.0
Net Cash Used by Financing Activities	(106.2)	(101.8)
Cash and Bank Deposits at Beginning of Year	119.2	75.0
Net Increase in Cash and Bank Deposits	3.9	31.6
Cash and Bank Deposits at End of Period	$ 123.1	$ 106.6