CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities
Net Income	$ 641.0	$ 684.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(4.6)	(39.2)
Change in Deferred Acquisition Costs	(49.7)	(48.7)
Change in Insurance Reserves and Liabilities	233.9	234.8
Change in Income Taxes	164.0	208.4
Change in Other Accrued Liabilities	5.7	24.9
Non-cash Components of Net Investment Income	(129.9)	(140.9)
Net Realized Investment (Gain) Loss	41.1	(33.4)
Depreciation	74.0	66.0
Other, Net	23.9	(12.2)
Net Cash Provided by Operating Activities	999.4	944.0
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	605.1	355.6
Proceeds from Maturities of Fixed Maturity Securities	1,718.8	1,284.0
Proceeds from Sales and Maturities of Other Investments	243.4	158.9
Purchases of Fixed Maturity Securities	(3,269.5)	(2,225.8)
Purchases of Other Investments	(343.1)	(150.3)
Net Sales (Purchases) of Short-term Investments	381.5	(31.2)
Net Increase in Payables for Collateral on Investments	336.6	0.7
Acquisition of Business	(54.3)	0.0
Net Purchases of Property and Equipment	(73.3)	(86.8)
Net Cash Used by Investing Activities	(454.8)	(694.9)
Cash Flows from Financing Activities
Issuance of Long-term Debt	0.0	347.2
Long-term Debt Repayments	(62.6)	(180.2)
Cost Related to Early Retirement of Debt	0.0	(13.2)
Issuance of Common Stock	3.0	3.8
Repurchase of Common Stock	(326.2)	(304.1)
Dividends Paid to Stockholders	(129.2)	(117.7)
Other, Net	(22.8)	(18.4)
Net Cash Used by Financing Activities	(537.8)	(282.6)
Net Increase (Decrease) in Cash and Bank Deposits	6.8	(33.5)
Cash and Bank Deposits at Beginning of Year	102.5	94.1
Cash and Bank Deposits at End of Period	$ 109.3	$ 60.6