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Investments in Other Companies (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2012
TRIP
Jul. 31, 2012
TRIP
Sale of interest
item
Y
Sep. 30, 2008
TRIP
Common stock
Sep. 30, 2012
Trip Investimentos Ltda.
item
Sep. 30, 2012
Trip Investimentos Ltda.
Jul. 31, 2012
Trip Investimentos Ltda.
Sale of interest
Jul. 31, 2012
Trip Investimentos Ltda.
Sale of interest
Minimum
Y
Jul. 31, 2012
Trip Investimentos Ltda.
Sale of interest
Maximum
Y
Sep. 30, 2010
Air Mekong
Dec. 31, 2011
Air Mekong
Sep. 30, 2012
Air Mekong
Sep. 30, 2012
Trip and Air Mekong
Sep. 30, 2011
Trip and Air Mekong
Investment in Other Companies                          
Percentage ownership acquired     20.00%           30.00%        
Company's investment balance $ 19.5                   $ 1.3    
The annual rate of return used to calculate the put option price (as a percent) 5.00%                        
Proceeds from sale of equity method investment   42.0   8.4                  
Second installment of equity interest sold         16.8                
Third installment of equity interest sold         16.8                
Number of installments   3   3                  
Period of payment under purchase agreement (in years)   2                      
Option to acquire ownership (as a percent)         15.38% 15.38%              
Option exercise period (in years)             2 4          
Payments to acquire equity method investment                 7 3      
Company's portion of the losses attributable to its investments                       $ 10.1 $ 8.5