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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2011
Hertz Holdings
Jun. 29, 2007
Hertz Holdings
Related Party Transactions        
Outstanding debt with related parties $ 185 $ 174    
Line of Credit Facility, Maximum Borrowing Capacity       100.0
Borrowings outstanding     $ 0.4