CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities
Net Income	$ 660.8	$ 660.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(45.8)	(44.1)
Change in Deferred Acquisition Costs	(71.7)	(47.8)
Change in Insurance Reserves and Liabilities	321.7	440.4
Change in Income Taxes	41.2	124.5
Change in Other Accrued Liabilities	12.4	(35.9)
Non-cash Adjustments to Net Investment Income	(206.6)	(225.6)
Net Realized Investment Loss	12.3	2.8
Depreciation	60.2	56.1
Other, Net	4.2	(16.9)
Net Cash Provided by Operating Activities	788.7	913.8
Cash Flows from Investing Activities
Proceeds from Sales of Available-for-Sale Securities	908.8	723.9
Proceeds from Maturities of Available-for-Sale Securities	1,235.0	1,682.4
Proceeds from Sales and Maturities of Other Investments	101.3	102.3
Purchase of Available-for-Sale Securities	(2,162.2)	(2,958.7)
Purchase of Other Investments	(234.3)	(222.1)
Net Sales (Purchases) of Short-term Investments	86.3	(70.3)
Other, Net	(75.9)	(100.4)
Net Cash Used by Investing Activities	(141.0)	(842.9)
Cash Flows from Financing Activities
Net Short-term Debt Repayments	117.3	0
Issuance of Long-term Debt	0	396.9
Long-term Debt Repayments	(66.9)	(62.7)
Issuance of Common Stock	7.6	9.4
Repurchase of Common Stock	(619.9)	(324.0)
Dividends Paid to Stockholders	(90.3)	(85.4)
Other, Net	3.2	1.9
Net Cash Used by Financing Activities	(649.0)	(63.9)
Effect of Foreign Exchange Rate Changes on Cash	(0.1)	0
Net Increase (Decrease) in Cash and Bank Deposits	(1.4)	7.0
Cash and Bank Deposits at Beginning of Year	53.6	71.6
Cash and Bank Deposits at End of Period	$ 52.2	$ 78.6