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Investments In And Advances To Nonconsolidated Affiliates (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Summary of combined results of operations of our equity method affiliates:          
Net operating revenues $ 21.2 $ 20.2 $ 41.6 $ 40.3  
Operating expenses (12.7) (13.1) (25.8) (26.0)  
Income from continuing operations, net of tax 7.0 5.9 12.6 11.8  
Net income 7.0 5.9 12.6 11.8  
Investments In And Advances to Nonconsolidated Affiliates (Textuals)          
Investments in and advances to nonconsolidated affiliates $ 30.5   $ 30.5   $ 30.7
Number of partially owned subsidiaries 15   15    
Number of general or limited partnerships, limited liability companies, or joint ventures 11   11    
Minimum [Member]
         
Investments in and Advances to Nonconsolidated Affiliates (Textuals)          
Affiliates,Ownership Percentage 1.00%   1.00%    
Maximum [Member]
         
Investments in and Advances to Nonconsolidated Affiliates (Textuals)          
Affiliates,Ownership Percentage 51.00%   51.00%