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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Jan. 02, 2009
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Prior period reclassification adjustment     $ 99.8
Total accrued professional liability   122.8 111.7
Long-term investments maturity, minimum years   1  
Long-term investments maturity, maximum years   6  
Additional cash amounts to be paid based on achievement of performance measures within period, maximum years 5    
Intangible assets finite lives, minimum years   1  
Intangible assets finite lives, maximum years   20  
Money market funds carrying amount   11.6 11.7
Cash surrender value, fair value   12.7 12.5
Contingent consideration liabilities related to acquisitions   $ 32.4 $ 24.8
Buildings [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Property and equipment estimated useful lives, years   20  
Medical Equipment [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Property and equipment useful lives estimated, minimum years   3  
Property and equipment useful lives estimated, maximum years   10  
Computer Equipment [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Property and equipment useful lives estimated, minimum years   3  
Property and equipment useful lives estimated, maximum years   10  
Software [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Property and equipment useful lives estimated, minimum years   3  
Property and equipment useful lives estimated, maximum years   10  
Furniture [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Property and equipment useful lives estimated, minimum years   3  
Property and equipment useful lives estimated, maximum years   10  
Government Contracts Concentration Risk [Member] | Accounts Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of net accounts receivable   23.00% 24.00%