CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities
Net Income	$ 426.5	$ 562.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Deferred Policy Acquisition Costs	5.0	(21.8)
Change in Receivables	91.9	57.2
Change in Insurance Reserves and Liabilities	243.8	243.6
Change in Income Taxes	82.3	236.7
Change in Other Accrued Liabilities	(52.4)	15.0
Non-cash Components of Net Investment Income	(163.0)	(231.4)
Net Realized Investment Loss	110.2	6.2
Depreciation	55.8	54.9
Other, Net	52.3	20.2
Net Cash Provided by Operating Activities	852.4	942.7
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	363.5	606.9
Proceeds from Maturities of Fixed Maturity Securities	891.7	811.1
Proceeds from Sales and Maturities of Other Investments	114.1	187.1
Purchases of Fixed Maturity Securities	(1,068.3)	(1,906.1)
Purchases of Other Investments	(250.2)	(153.0)
Net Purchases of Short-term Investments	(1,251.0)	(388.3)
Net Increase (Decrease) in Payables for Collateral on Investments	187.0	(100.0)
Net Purchases of Property and Equipment	(77.5)	(64.9)
Net Cash Used by Investing Activities	(1,090.7)	(1,007.2)
Cash Flows from Financing Activities
Proceeds from Issuance of Long-term Debt	494.1	395.9
Long-term Debt Repayment	(30.0)	(30.0)
Issuance of Common Stock	2.3	3.5
Repurchase of Common Stock	0.0	(200.2)
Dividends Paid to Stockholders	(115.8)	(110.9)
Other, Net	(30.8)	(27.0)
Net Cash Used by Financing Activities	319.8	31.3
Net Increase (Decrease) in Cash and Bank Deposits	81.5	(33.2)
Cash and Bank Deposits at Beginning of Year	84.1	94.0
Cash and Bank Deposits at End of Period	$ 165.6	$ 60.8