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Conversion Expenses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2012
InterContinental Hotels Group [Member]
 
Real Estate Properties [Line Items]  
Termination Fees $ 30.7
Holiday Inn® [Member]
 
Real Estate Properties [Line Items]  
Number of Real Estate Properties Converting Brands (in hotels) 8