Commitments and Contingencies (Details) (USD $)	12 Months Ended					12 Months Ended					12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 AmCareco Litigation [Member]	Dec. 31, 2013 Connecticut Commercial Campus [Member]	Dec. 31, 2013 Connecticut Commercial Campus [Member] Minimum [Member]	Dec. 31, 2013 Connecticut Commercial Campus [Member] Maximum [Member]	Dec. 31, 2013 California Headquarters [Member]	Dec. 31, 2013 California Office Space [Member]	Dec. 31, 2013 Litigation Related to Military Family Life Consultants [Member] actions	Dec. 31, 2013 Litigation Related to Information Security Issues [Member] employees_members_providers actions	Mar. 28, 2011 Litigation Related to Information Security Issues [Member] claims	Mar. 18, 2011 Litigation Related to Information Security Issues [Member] Customers	Dec. 31, 2013 Pharmacy and Health Quality Services [Member]	Dec. 31, 2013 Pharmacy and Health Quality Services [Member] Minimum [Member]	Dec. 31, 2013 Pharmacy and Health Quality Services [Member] Maximum [Member]	Dec. 31, 2013 IT Infrastructure Management Services [Member]	Dec. 31, 2013 Software Applications Development Services [Member]	Dec. 31, 2013 Claims Processing Services [Member]
Commitments and Contingencies [Line Items]
Number of pending litigations										3	3
Number of former MFLCs filing putative class action										2
Number of other named plaintiffs										12
Total number of people with information on drives											2,000,000
Number of pending litigations after consolidation											2
Period of free credit monitoring dervices											2 years
Estimated putative class members													800,000
Damages sought for each member in class													$ 1,000
Number of named plaintiffs' claims on which arbitration was requested												2
Number of motions for arbitration granted												1
Litigation settlement amount, per member, maximum											50,000
Litigation settlement amount, maximum											2,000,000
Award for Plaintiffs' counsel fees and expenses											2,300,000
Loss Contingency, Settlement Agreement, Terms											Under the terms of the Settlement Agreement, which would cover all individuals whose personal information was identified as being on the unaccounted-for server drives, class members who did not previously accept our offer of the credit monitoring and related services described above would be eligible to receive such credit monitoring and related services for a period of two years at no cost to them. Class members who previously accepted our original offer would be eligible to receive one additional year of such services. In addition, under the Settlement Agreement, class members would be eligible to receive reimbursement for certain unreimbursed losses arising from identity theft during a specified time period, up to a cap of $50,000 per class member, and $2 million in the aggregate. The Settlement Agreement also provides that we will continue our ongoing activities to enhance our information security measures, including the encryption of data at rest on our servers and storage area networks. We will also be responsible for the payment of the award by the Sacramento County Superior Court of approximately $2.3 million in fees and expenses to plaintiffs' counsel for the three class actions described above. Finally, we will be responsible for the costs of administering the Settlement Agreement.
Number of litigations matters				2
Number of separate states receivers				3
Number of health plans liquidated				3
Former subsidiary merged				1
Payments for legal settlements				181,000,000
Operating Leases [Abstract]
Operating lease impairment					7,400,000
Credit adjusted risk free interest rate					3.26%
Remaining operating lease agreement term						3 years	4 years
Long-Term Purchase Obligations [Abstract]
Long-term purchase commitment, amount														123,600,000			99,100,000	65,000,000	30,500,000
Remaining long term purchase obligation term															2 years	3 years	1 year	1 year	3 years
Operating Leases, Future Minimum Commitments [Abstract]
2014	55,300,000
2015	51,000,000
2016	43,800,000
2017	32,400,000
2018	24,400,000
Thereafter	65,500,000
Total minimum commitments	272,400,000							3,400,000	94,500,000
Unrecorded Unconditional Purchase Obligation [Abstract]
2014	275,700,000
2015	144,300,000
2016	64,700,000
2017	7,900,000
2018	2,200,000
Thereafter	0
Total minimum commitments	494,800,000
Operating Leases and Other Purchase Obligations [Abstract]
Lease expense	45,100,000	47,800,000	52,100,000
Long-term purchase obligation expense	$ 217,200,000	$ 214,900,000	$ 188,700,000