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Debt (Details) (USD $)
In Millions, unless otherwise specified
Sep. 01, 2011
Jun. 30, 2011
Jun. 16, 2011
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 300
Debt Instrument, Basis Spread on Variable Rate     0.33%
Percentage of principal company must offer to purchase all or part of the note if certain change of control events occur     101.00%
Long-term Line of Credit   500  
Revolving credit due to expire 500    
Line of credit facility, maximum borrowing capacity   $ 1,500