CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities
Net Income	$ 437.2	$ 465.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	134.9	115.7
Change in Deferred Acquisition Costs	(27.3)	(28.8)
Change in Insurance Reserves and Liabilities	204.9	212.3
Change in Income Taxes	141.2	169.8
Change in Other Accrued Liabilities	(55.9)	(35.5)
Non-cash Components of Net Investment Income	(195.4)	(190.2)
Net Realized Investment (Gain) Loss	14.5	(32.2)
Depreciation	48.6	42.9
Other, Net	23.7	6.6
Net Cash Provided by Operating Activities	726.4	725.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	266.3	288.7
Proceeds from Maturities of Fixed Maturity Securities	1,164.4	1,011.4
Proceeds from Sales and Maturities of Other Investments	153.8	116.1
Purchase of Fixed Maturity Securities	(2,239.2)	(1,658.3)
Purchase of Other Investments	(194.7)	(134.9)
Net Sales (Purchases) of Short-term Investments	213.7	(129.1)
Net Increase (Decrease) in Payables for Collateral on Investments	336.1	(16.6)
Net Purchases of Property and Equipment	(53.1)	(58.4)
Net Cash Used by Investing Activities	(352.7)	(581.1)
Cash Flows from Financing Activities
Issuance of Long-term Debt	0.0	347.2
Long-term Debt Repayments	(48.4)	(175.0)
Cost Related to Early Retirement of Debt	0.0	(13.2)
Issuance of Common Stock	2.2	3.0
Repurchase of Common Stock	(211.2)	(202.7)
Dividends Paid to Stockholders	(83.5)	(75.7)
Other, Net	(12.7)	(10.4)
Net Cash Used by Financing Activities	(353.6)	(126.8)
Net Increase in Cash and Bank Deposits	20.1	17.9
Cash and Bank Deposits at Beginning of Year	102.5	94.1
Cash and Bank Deposits at End of Period	$ 122.6	$ 112.0