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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Oct. 29, 2010
Dec. 31, 2011
May 31, 2010
May 31, 2009
Derivative Financial Instruments [Abstract]        
Interest rate swap agreement effective date October 29, 2010      
Notional amount of interest rate swap agreement $ 300      
Interest rate swap agreement termination date October 31, 2014      
Effective fixed interest rate for swap agreement   0.896%    
Derivative losses included in OCI to be reclassified into earnings within next 12 months   2    
Credit facility interest rate   2.05%    
Gains (losses) were reclassified from OCI into earnings   0    
Realized gains (losses) on derivatives   $ 0 $ 0 $ 0