ACQUISITIONS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 business_combinations
Schedule Of Immaterial Business Acquisitions By Acquisition [Line Items]
Number of business combinations completed	3
PHS [Member]
Schedule Of Immaterial Business Acquisitions By Acquisition [Line Items]
Effective date	Feb. 01, 2010
Purchase price	94.3
Number of commercial group risk members	100,000
Number of commercial self-funded members	20,000
MHP [Member]
Schedule Of Immaterial Business Acquisitions By Acquisition [Line Items]
Effective date	Oct. 01, 2010
Purchase price	112.3
Number of commercial group risk members	90,000
Number of commercial self-funded members	60,000
Number of Medicare Advantage Coordinated Care Plan members	30,000
FHP [Member]
Schedule Of Immaterial Business Acquisitions By Acquisition [Line Items]
Effective date	Jan. 01, 2012
Purchase price	52.1
Number of Medicaid members	210,000
Goodwill	42.7
PHS and MHP [Member]
Schedule Of Immaterial Business Acquisitions By Acquisition [Line Items]
Goodwill	30.9