CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net Income	$ 280.9	$ 273.5
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(10.7)	(29.4)
Change in Deferred Acquisition Costs	(3.1)	(17.8)
Change in Insurance Reserves and Liabilities	90.7	183.8
Change in Income Taxes	253.1	56.4
Change in Other Accrued Liabilities	(35.8)	(110.4)
Non-cash Components of Net Investment Income	(95.6)	(95.2)
Net Realized Investment (Gain) Loss	(1.1)	2.2
Depreciation	27.4	24.6
Other, Net	11.0	12.2
Net Cash Provided by Operating Activities	516.8	299.9
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	361.0	84.8
Proceeds from Maturities of Fixed Maturity Securities	369.6	469.8
Proceeds from Sales and Maturities of Other Investments	133.3	82.3
Purchases of Fixed Maturity Securities	(822.0)	(835.4)
Purchases of Other Investments	(53.2)	(90.0)
Net Sales (Purchases) of Short-term Investments	(217.9)	450.9
Net Decrease in Payables for Collateral on Investments	(107.9)	(14.0)
Net Purchases of Property and Equipment	(28.1)	(29.1)
Net Cash Provided (Used) by Investing Activities	(365.2)	119.3
Cash Flows from Financing Activities
Long-term Debt Repayments	(15.0)	(15.0)
Issuance of Common Stock	1.4	1.3
Repurchase of Common Stock	(100.0)	(105.7)
Dividends Paid to Stockholders	(55.7)	(52.4)
Other, Net	(14.2)	(15.9)
Net Cash Used by Financing Activities	(183.5)	(187.7)
Net Increase (Decrease) in Cash and Bank Deposits	(31.9)	231.5
Cash and Bank Deposits at Beginning of Year	94.0	77.4
Cash and Bank Deposits at End of Period	$ 62.1	$ 308.9