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Basis Of Presentation And Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Reserves for future policy benefits, maximum payable period 1 year    
Initial cash collateral percentage value on securities loan 102.00%    
Minimum percentage of cash collateral on market value of security loan 100.00%    
Fair value of collateral received $ 969.7 $ 564.7  
Percentage of collateral delivered on market value security loan 102.00%    
Employee stock purchase plan purchase price per share as a percent of closing price 95.00%    
Advertising and marketing expense 350.9 285.4 287.8
2014 Federal Government fees to be allocated to health insurers 8,000.0    
Estimated portion of fees paid to the federal government by health insurers 900.0    
Buildings and Components [Member] | Minimum [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property and equipment, useful life 15 years    
Buildings and Components [Member] | Maximum [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property and equipment, useful life 39 years    
Data Processing Equipment, Furniture And Other Equipment [Member] | Minimum [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property and equipment, useful life 3 years    
Data Processing Equipment, Furniture And Other Equipment [Member] | Maximum [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property and equipment, useful life 7 years    
Computer Software [Member] | Minimum [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property and equipment, useful life 3 years    
Computer Software [Member] | Maximum [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Property and equipment, useful life 5 years    
Premium And Self-Funded Receivables [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Allowance for doubtful accounts, premiums receivable 223.6 197.1  
Other Receivables [Member]
     
Basis Of Presentation And Significant Accounting Policies [Line Items]      
Allowance for doubtful accounts, other receivables $ 115.0 $ 79.0