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Guarantees And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Mar. 06, 2012
Mar. 02, 2009
Mar. 31, 2012
Sep. 24, 2010
Feb. 05, 2007
state
plaintiff
Loss Contingencies [Line Items]          
Number of states with hospitals in class action lawsuit         6
Number of named plaintiffs         7
Number of additional hospitals joined in class       33  
Confidence interval related to RADV audits     99.00%    
Total damage claim   $ 29.2      
Recovery to the claimants 2.2        
Recovery Related To Loss Contingency $ 1.1        
Original TRICARE South Region Contract [Member]
         
Loss Contingencies [Line Items]          
Contract term, years     5    
New TRICARE South Region Contract [Member]
         
Loss Contingencies [Line Items]          
Contract term, years     5    
Puerto Rico Health Insurance Administration Contracts East Southeast And Southwest Regions [Member]
         
Loss Contingencies [Line Items]          
Contract term, years     3    
Medicare [Member]
         
Loss Contingencies [Line Items]          
Percentage of premiums and services revenue     68.00%    
Medicaid [Member]
         
Loss Contingencies [Line Items]          
Percentage of premiums and services revenue     2.00%    
Military Services [Member]
         
Loss Contingencies [Line Items]          
Percentage of premiums and services revenue     9.00%