CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities
Net Income	$ 213.9	$ 223.6
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	1.6	33.8
Change in Deferred Acquisition Costs	(18.0)	(17.2)
Change in Insurance Reserves and Liabilities	167.3	112.6
Change in Income Taxes	116.7	82.0
Change in Other Accrued Liabilities	(68.0)	(32.1)
Non-cash Adjustments to Net Investment Income	(100.9)	(112.6)
Net Realized Investment Gain	(12.4)	(15.2)
Depreciation	20.5	19.3
Other, Net	8.6	6.8
Net Cash Provided by Operating Activities	329.3	301.0
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	127.6	243.7
Proceeds from Maturities of Fixed Maturity Securities	596.3	400.5
Proceeds from Sales and Maturities of Other Investments	33.5	35.5
Purchase of Fixed Maturity Securities	(845.7)	(898.6)
Purchase of Other Investments	(52.6)	(92.9)
Net Sales (Purchases) of Short-term Investments	(17.2)	524.4
Other, Net	(23.7)	(24.6)
Net Cash (Used) Provided by Investing Activities	(181.8)	188.0
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	59.9	(225.1)
Long-term Debt Repayments	(17.5)	(24.2)
Issuance of Common Stock	0.9	5.5
Repurchase of Common Stock	(175.2)	(215.7)
Dividends Paid to Stockholders	(31.4)	(29.9)
Other, Net	1.7	3.4
Net Cash Used by Financing Activities	(161.6)	(486.0)
Net Increase (Decrease) in Cash and Bank Deposits	(14.1)	3.0
Cash and Bank Deposits at Beginning of Year	116.6	53.6
Cash and Bank Deposits at End of Period	$ 102.5	$ 56.6