Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities
Net income	$ 701.0	$ 885.2
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized gains on investments	(41.7)	(16.8)
Other-than-temporary impairment losses recognized in income	10.8	37.9
Loss on extinguishment of debt	3.0	0
Gain on disposal from discontinued operations	(3.2)	0
Loss on disposal of assets	0.1	0.7
Deferred income taxes	85.2	9.1
Amortization, net of accretion	190.3	186.7
Depreciation expense	26.4	25.3
Impairment of property and equipment	2.1	0
Share-based compensation	38.8	21.5
Excess tax benefits from share-based compensation	(22.4)	(4.2)
Changes in operating assets and liabilities:
Receivables, net	(616.0)	(397.7)
Other invested assets	(14.6)	(8.2)
Other assets	(69.5)	(58.6)
Policy liabilities	545.6	70.9
Unearned income	250.0	(31.1)
Accounts payable and accrued expenses	(137.3)	(224.0)
Other liabilities	107.4	35.1
Income taxes	356.0	435.6
Other, net	(24.5)	(10.5)
Net cash provided by operating activities	1,387.5	956.9
Investing activities
Purchases of fixed maturity securities	(3,084.8)	(3,955.5)
Proceeds from fixed maturity securities:
Sales	2,061.2	2,531.8
Maturities, calls and redemptions	284.3	490.8
Purchases of equity securities	(228.6)	(29.2)
Proceeds from sales of equity securities	30.3	87.4
Purchases of other invested assets	(35.4)	(127.5)
Proceeds from sales of other invested assets	25.6	7.6
Settlement of non-hedging derivatives	(46.2)	(80.6)
Changes in securities lending collateral	(354.9)	(12.9)
Proceeds from sale of subsidiary, net of cash sold	740.0	0
Purchases of property and equipment	(135.7)	(107.5)
Other, net	(0.1)	0
Net cash used in investing activities	(744.3)	(1,195.6)
Financing activities
Net proceeds from commercial paper borrowings	379.4	260.3
Repayments of long-term borrowings	(24.2)	(556.9)
Proceeds from short-term borrowings	970.0	100.0
Repayments of short-term borrowings	(780.0)	0
Changes in securities lending payable	354.9	12.8
Changes in bank overdrafts	75.0	30.4
Repurchase and retirement of common stock	(1,262.8)	(340.2)
Cash dividends	(123.4)	(113.4)
Proceeds from issuance of common stock under employee stock plans	130.1	23.7
Excess tax benefits from share-based compensation	22.4	4.2
Net cash used in financing activities	(258.6)	(579.1)
Effect of foreign exchange rates on cash and cash equivalents	(0.3)	(1.5)
Change in cash and cash equivalents	384.3	(819.3)
Cash and cash equivalents, at beginning of period	1,586.9	2,484.6
Cash and cash equivalents, at end of period	1,971.2	1,665.3
Less cash and cash equivalents of discontinued operations at end of period	0	(5.7)
Cash and cash equivalents of continuing operations at end of period	$ 1,971.2	$ 1,659.6