Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Premiums	$ 16,517.0	$ 16,435.6
Administrative fees	1,118.3	990.1
Other revenue	9.5	9.4
Total operating revenue	17,644.8	17,435.1
Net investment income	183.7	162.0
Net realized gains on investments	41.7	16.8
Other-than-temporary impairment losses on investments:
Total other-than-temporary impairment losses on investments	(10.8)	(37.9)
Portion of other-than-temporary impairment losses recognized in other comprehensive income	0	0
Other-than-temporary impairment losses recognized in income	(10.8)	(37.9)
Total revenues	17,859.4	17,576.0
Expenses
Benefit expense	13,664.6	13,748.7
Selling, general and administrative expense:
Selling expense	370.8	385.9
General and administrative expense	2,490.7	1,943.2
Total selling, general and administrative expense	2,861.5	2,329.1
Interest expense	146.2	153.5
Amortization of other intangible assets	54.0	62.2
Loss on extinguishment of debt	3.0	0
Total expenses	16,729.3	16,293.5
Income from continuing operations before income tax expense	1,130.1	1,282.5
Income tax expense	438.7	410.2
Income from continuing operations	691.4	872.3
Income from discontinued operations, net of tax	9.6	12.9
Net income	$ 701.0	$ 885.2
Net income per share
Basic - continuing operations (in dollars per share)	$ 2.43	$ 2.88
Basic - discontinued operations (in dollars per share)	$ 0.03	$ 0.04
Basic net income per share	$ 2.46	$ 2.92
Diluted - continuing operations (in dollars per share)	$ 2.37	$ 2.85
Diluted - discontinued operations (in dollars per share)	$ 0.03	$ 0.04
Diluted net income per share	$ 2.40	$ 2.89
Dividends per share	$ 0.4375	$ 0.375