Sale of Medicare PDP Business and Northeast Business (Details) (USD $)	3 Months Ended			12 Months Ended			0 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2013 Customers	Dec. 31, 2012	Dec. 31, 2011	Apr. 02, 2012 Divested Operations and Services [Member]	Apr. 02, 2012 Medicare PDP Business [Member]	Dec. 31, 2013 Medicare PDP Business [Member] Customers	Dec. 31, 2012 Medicare PDP Business [Member] Customers	Dec. 31, 2011 Medicare PDP Business [Member]	Apr. 02, 2012 Medicare PDP Business [Member] Divested Operations and Services [Member]	Dec. 31, 2012 Northeast Operations [Member]	Dec. 31, 2011 Northeast Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal date								Apr. 01, 2012
Proceeds from divestiture of business				$ 0	$ 0	$ 162,101,000				$ 248,200,000
Pretax gain on sale of business										132,800,000
Gain on sale of discontinued operation, net of tax	(2,200,000)	(2,400,000)	119,400,000	0	114,834,000	0				114,800,000
Deferred revenue												12,000,000
Deferred revenue, recognition period												9 months
Discount rate							1.20%
Disposal group, revenues related to divested business									0	192,100,000	485,600,000
Disposal group, pretax income (loss) related to divested business									0	(28,800,000)	17,200,000
Number of customers				5,300,000					0	0
Adjustment to loss on sale of Northeast health plan subsidiaries				$ 0	$ 0	$ (40,815,000)							$ 0	$ 40,800,000