CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities
Net Income	$ 683.4	$ 641.0
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(65.7)	(4.6)
Change in Deferred Acquisition Costs	(69.8)	(49.7)
Change in Insurance Reserves and Liabilities	274.1	233.9
Change in Income Taxes	(0.8)	164.0
Change in Other Accrued Liabilities	(37.6)	5.7
Non-cash Components of Net Investment Income	(135.0)	(139.4)
Net Realized Investment Loss	4.2	41.1
Depreciation	75.9	74.0
Other, Net	26.2	33.4
Net Cash Provided by Operating Activities	754.9	999.4
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	726.6	605.1
Proceeds from Maturities of Fixed Maturity Securities	1,504.1	1,718.8
Proceeds from Sales and Maturities of Other Investments	257.7	243.4
Purchases of Fixed Maturity Securities	(2,452.3)	(3,269.5)
Purchases of Other Investments	(431.4)	(343.1)
Net Sales of Short-term Investments	38.6	381.5
Net Increase in Payables for Collateral on Investments	24.7	336.6
Acquisition of Business, Net of Cash Acquired	128.5	54.3
Net Purchases of Property and Equipment	(60.1)	(73.3)
Net Cash Used by Investing Activities	(520.6)	(454.8)
Cash Flows from Financing Activities
Issuance of Long-term Debt	609.1	0.0
Long-term Debt Repayments	(399.0)	(62.6)
Issuance of Common Stock	3.6	3.0
Repurchase of Common Stock	(309.1)	(326.2)
Dividends Paid to Stockholders	(136.2)	(129.2)
Other, Net	(27.7)	(22.8)
Net Cash Used by Financing Activities	(259.3)	(537.8)
Net Increase (Decrease) in Cash and Bank Deposits	(25.0)	6.8
Cash and Bank Deposits at Beginning of Year	112.9	102.5
Cash and Bank Deposits at End of Period	$ 87.9	$ 109.3