Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Premiums	$ 17,226.0	$ 16,580.9	$ 50,811.9	$ 49,509.5
Administrative fees	1,134.4	1,027.8	3,404.3	3,006.4
Other revenue	10.3	10.0	29.3	29.8
Total operating revenue	18,370.7	17,618.7	54,245.5	52,545.7
Net investment income	174.4	167.6	546.6	482.8
Net realized gains on investments	25.7	95.4	133.2	166.4
Other-than-temporary impairment losses on investments:
Total other-than-temporary impairment losses on investments	(19.4)	(27.1)	(41.9)	(74.0)
Portion of other-than-temporary impairment losses recognized in other comprehensive income	5.6	0.9	6.4	0.9
Other-than-temporary impairment losses recognized in income	(13.8)	(26.2)	(35.5)	(73.1)
Total revenues	18,557.0	17,855.5	54,889.8	53,121.8
Expenses
Benefit expense	14,211.1	14,075.0	41,997.0	41,656.3
Selling, general and administrative expense:
Selling expense	374.3	377.3	1,133.8	1,139.9
General and administrative expense	2,594.0	2,165.4	7,581.8	6,167.5
Total selling, general and administrative expense	2,968.3	2,542.7	8,715.6	7,307.4
Interest expense	155.3	151.5	447.1	456.9
Amortization of other intangible assets	60.3	61.3	168.3	185.6
Loss on extinguishment of debt	74.8	145.3	80.8	145.3
Total expenses	17,469.8	16,975.8	51,408.8	49,751.5
Income from continuing operations before income tax expense	1,087.2	879.7	3,481.0	3,370.3
Income tax expense	456.3	225.9	1,427.6	1,044.9
Income from continuing operations	630.9	653.8	2,053.4	2,325.4
Income from discontinued operations, net of tax	0	2.4	9.6	16.1
Net income	$ 630.9	$ 656.2	$ 2,063.0	$ 2,341.5
Net income per share
Basic - continuing operations (in dollars per share)	$ 2.31	$ 2.20	$ 7.39	$ 7.75
Basic - discontinued operations (in dollars per share)	$ 0.00	$ 0.01	$ 0.03	$ 0.06
Basic net income per share	$ 2.31	$ 2.21	$ 7.42	$ 7.81
Diluted - continuing operations (in dollars per share)	$ 2.22	$ 2.15	$ 7.15	$ 7.64
Diluted - discontinued operations (in dollars per share)	$ 0.00	$ 0.01	$ 0.03	$ 0.05
Diluted net income per share	$ 2.22	$ 2.16	$ 7.18	$ 7.69
Dividends per share	$ 0.4375	$ 0.3750	$ 1.3125	$ 1.1250