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Financial Guarantees (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Financial Guarantees    
Term of standby letters of credit, years 1  
Notional amount of standby letters of credit $ 73.7 $ 74.3
Carrying value of letter of credit 0.5 0.5
Interest rate swap $ 9