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Basis of Presentation (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Basis of Presentation (Textuals) [Abstract]          
Investment in preferred stock of other business venture $ 1.0   $ 1.0   $ 1.5
Total assets 12.7   12.7    
Total carrying value of investments in new business ventures 4.3   4.3   3.1
Basis of Presentation (Additional Textuals) [Abstract]          
Variable interest entity, Assets 0   0   0
Variable interest entity, Liabilities 0   0   0
Variable Interest Entity, Primary Beneficiary [Member]
         
Basis of Presentation (Textuals) [Abstract]          
Carrying value of investments 0   0   0
Variable Interest Entity, Not Primary Beneficiary [Member]
         
Basis of Presentation (Textuals) [Abstract]          
Carrying value of equity investments 3.3   3.3   1.6
Investment in preferred stock of other business venture 1.5   1.5    
Total assets 12.7   12.7   11.1
Total liabilities 12.7   12.7   11.1
Earnings of the investees 0 0 0 0  
Total carrying value of investments in new business ventures $ 4.3   $ 4.3   $ 3.1