CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows from Operating Activities
Net Income	$ 447.4	$ 437.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	48.1	134.9
Change in Deferred Acquisition Costs	(40.8)	(27.3)
Change in Insurance Reserves and Liabilities	211.0	204.9
Change in Income Taxes	44.5	141.2
Change in Other Accrued Liabilities	(37.6)	(55.9)
Non-cash Components of Net Investment Income	(190.5)	(195.4)
Net Realized Investment Loss	15.2	14.5
Depreciation	50.6	48.6
Other, Net	13.5	23.7
Net Cash Provided by Operating Activities	561.4	726.4
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	674.7	266.3
Proceeds from Maturities of Fixed Maturity Securities	917.2	1,164.4
Proceeds from Sales and Maturities of Other Investments	166.7	153.8
Purchases of Fixed Maturity Securities	(1,741.1)	(2,239.2)
Purchases of Other Investments	(259.0)	(194.7)
Net Sales (Purchases) of Short-term Investments	(604.2)	213.7
Net Increase in Payables for Collateral on Investments	34.8	336.1
Net Purchases of Property and Equipment	(41.6)	(53.1)
Net Cash Used by Investing Activities	(852.5)	(352.7)
Cash Flows from Financing Activities
Issuance of Long-term Debt	609.1	0.0
Long-term Debt Repayments	(24.0)	(48.4)
Issuance of Common Stock	2.7	2.2
Repurchase of Common Stock	(208.9)	(211.2)
Dividends Paid to Stockholders	(89.4)	(83.5)
Other, Net	(17.5)	(12.7)
Net Cash Provided (Used) by Financing Activities	272.0	(353.6)
Net Increase (Decrease) in Cash and Bank Deposits	(19.1)	20.1
Cash and Bank Deposits at Beginning of Year	112.9	102.5
Cash and Bank Deposits at End of Period	$ 93.8	$ 122.6