Sale of Medicare PDP Business (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Apr. 02, 2012	Jun. 30, 2013 Customers	Jun. 30, 2012 Customers	Jun. 30, 2013 Customers	Jun. 30, 2012 Customers
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operation, net of tax		$ 0	$ 119,440,000	$ 0	$ 119,440,000
Prescription Drug Plan (Medicare PDP) [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			248,200,000
Gain on sale of discontinued operation, before tax			132,800,000
Gain on sale of discontinued operation, net of tax			119,400,000
Number of customers		0	0	0	0
Discontinued operations revenues		0	0	0	191,800,000
Income (loss) from discontinued operations before income taxes		$ 0	$ 0	$ 0	$ (28,800,000)