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Guarantees (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Guarantees [Abstract]  
Expiration dates of guarantees2012 through 2017 
Potential maximum exposure under these lease guarantees$ 16.8$ 6.8
Material defaults0 
Liability for guarantees representing fair value based on discounted cash-flow analysis$ 0.3$ 0.1