CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities
Net Income	$ 161.0	$ 280.9
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(8.7)	(10.7)
Change in Deferred Acquisition Costs	14.2	(3.1)
Change in Insurance Reserves and Liabilities	67.5	90.7
Change in Income Taxes	24.9	253.1
Change in Other Accrued Liabilities	(121.3)	(35.8)
Non-cash Components of Net Investment Income	(92.5)	(95.6)
Net Realized Investment (Gain) Loss	144.0	(1.1)
Depreciation	28.5	27.4
Other, Net	2.3	11.0
Net Cash Provided by Operating Activities	219.9	516.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	120.7	361.0
Proceeds from Maturities of Fixed Maturity Securities	414.3	369.6
Proceeds from Sales and Maturities of Other Investments	48.5	133.3
Purchases of Fixed Maturity Securities	(780.5)	(822.0)
Purchases of Other Investments	(144.2)	(53.2)
Net Sales (Purchases) of Short-term Investments	15.5	(217.9)
Net Increase (Decrease) in Payables for Collateral on Investments	487.4	(107.9)
Net Purchases of Property and Equipment	(39.1)	(28.1)
Net Cash Provided (Used) by Investing Activities	122.6	(365.2)
Cash Flows from Financing Activities
Long-term Debt Repayment	(15.0)	(15.0)
Issuance of Common Stock	1.3	1.4
Repurchase of Common Stock	0.0	(100.0)
Dividends Paid to Stockholders	(57.8)	(55.7)
Other, Net	(17.9)	(14.2)
Net Cash Used by Financing Activities	(89.4)	(183.5)
Net Increase (Decrease) in Cash and Bank Deposits	253.1	(31.9)
Cash and Bank Deposits at Beginning of Year	84.1	94.0
Cash and Bank Deposits at End of Period	$ 337.2	$ 62.1