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Investments in and Advances to Nonconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Hospital
Entity
Guarantee
Sep. 30, 2010
Sep. 30, 2011
Hospital
Entity
Guarantee
Sep. 30, 2010
Dec. 31, 2010
Summary of combined results of operations of our equity method affiliates:     
Net operating revenues$ 22.4$ 19.4$ 64.0$ 59.7 
Operating expenses(13.3)(12.7)(39.1)(38.7) 
Income from continuing operations, net of tax7.05.319.617.1 
Net income7.05.319.617.1 
Investments in and advances to nonconsolidated affiliates$ 29.4 $ 29.4 $ 30.7
Number of partially owned subsidiaries15 15  
Number of general or limited partnerships, limited liability companies, or joint ventures11 11  
Maximum [Member]
     
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]     
Affiliates, Ownership Percentage51.00% 51.00%  
Minimum [Member]
     
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]     
Affiliates, Ownership Percentage1.00% 1.00%