CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net Income	$ 431.2	$ 430.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(95.0)	70.6
Change in Deferred Acquisition Costs	(6.4)	(38.0)
Change in Insurance Reserves and Liabilities	364.5	311.7
Change in Income Taxes	(64.9)	134.7
Change in Other Accrued Liabilities	(6.0)	(65.1)
Non-cash Adjustments to Net Investment Income	(194.8)	(203.5)
Net Realized Investment Gain	(23.6)	(10.3)
Depreciation	42.7	41.2
Other, Net	0.6	7.5
Net Cash Provided by Operating Activities	448.3	679.1
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	288.8	242.2
Proceeds from Maturities of Fixed Maturity Securities	972.7	1,041.9
Proceeds from Sales and Maturities of Other Investments	112.7	76.7
Purchase of Fixed Maturity Securities	(1,584.9)	(1,640.8)
Purchase of Other Investments	(149.4)	(167.5)
Net Sales (Purchases) of Short-term Investments	589.4	(28.8)
Other, Net	(54.5)	(44.6)
Net Cash Provided (Used) by Investing Activities	174.8	(520.9)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	(302.2)	154.8
Long-term Debt Repayments	(86.2)	(34.2)
Issuance of Common Stock	3.3	2.9
Repurchase of Common Stock	(197.4)	(300.3)
Dividends Paid to Stockholders	(70.4)	(61.6)
Other, Net	0.3	1.6
Net Cash Used by Financing Activities	(652.6)	(236.8)
Net Decrease in Cash and Bank Deposits	(29.5)	(78.6)
Cash and Bank Deposits at Beginning of Year	77.3	116.6
Cash and Bank Deposits at End of Period	$ 47.8	$ 38.0