CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities
Net Income	$ 657.6	$ 804.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	163.2	7.1
Increase (Decrease) in Deferred Policy Acquisition Costs	19.8	(36.1)
Change in Insurance Reserves and Liabilities	129.2	302.6
Change in Income Taxes	162.0	215.3
Change in Other Accrued Liabilities	(1.5)	(29.9)
Non-cash Components of Net Investment Income	(111.3)	(178.9)
Net Realized Investment Loss	105.8	32.4
Depreciation	85.6	82.6
Other, Net	68.4	57.6
Net Cash Provided by Operating Activities	1,278.8	1,256.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	499.7	862.5
Proceeds from Maturities of Fixed Maturity Securities	1,594.2	1,392.3
Proceeds from Sales and Maturities of Other Investments	163.9	272.0
Purchases of Fixed Maturity Securities	(2,229.5)	(2,866.9)
Purchases of Other Investments	(289.6)	(354.9)
Net Purchases of Short-term Investments	(769.8)	(306.2)
Net Increase (Decrease) in Payables for Collateral on Investments	40.5	(97.5)
Net Purchases of Property and Equipment	(99.5)	(107.5)
Payments for (Proceeds from) Other Investing Activities	0.0	0.3
Net Cash Used by Investing Activities	(1,090.1)	(1,205.9)
Cash Flows from Financing Activities
Repayments of Short-term Debt	(400.0)	0.0
Proceeds from Issuance of Long-term Debt	494.1	841.9
Long-term Debt Repayment	(45.0)	(381.5)
Payment for Debt Extinguishment or Debt Prepayment Cost	0.0	(24.1)
Issuance of Common Stock	3.3	4.7
Repurchase of Common Stock	0.0	(297.2)
Dividends Paid to Stockholders	(173.8)	(170.3)
Other, Net	(47.6)	(41.4)
Net Cash Used by Financing Activities	(169.0)	(67.9)
Cash and Bank Deposits at Beginning of Year	84.1	94.0
Net Cash Provided by (Used in) Continuing Operations, Total	19.7	(17.0)
Cash and Bank Deposits at End of Period	$ 103.8	$ 77.0