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Senior Bank Debt (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Credit facility
   
Senior Bank Debt    
Maximum borrowing capacity $ 1,075.0  
Revolving credit facility
   
Senior Bank Debt    
Maximum borrowing capacity 825.0  
Portion of the principal balance maturing in January 2015 30.0  
Principal balance maturing in November 2016 795.0  
Option to increase the borrowing capacity under revolving credit facility 75.0  
Line of credit facility amount outstanding 325.0 250.0
Term loan
   
Senior Bank Debt    
Maximum borrowing capacity 250.0  
Option to increase the borrowing capacity under revolving credit facility $ 250.0