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Financial Instruments and Risk Management (Tables)
 9 Months Ended
Sep. 30, 2012
Investments, All Other Investments [Abstract]  
Components of aircraft fuel expense
The following table summarizes the components of aircraft fuel expense for the three and nine months ended September 30, 2012 and 2011:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2012
 
2011
 
2012
 
2011
 
(in millions)
Into-plane fuel cost
$
123.5

 
$
103.7

 
$
351.1

 
$
296.3

Realized losses (gains)
(0.6
)
 
(0.2
)
 
(0.5
)
 
(7.5
)
Unrealized losses (gains)
(0.9
)
 
1.5

 
0.4

 
4.4

Aircraft fuel expense
$
122.0

 
$
105.0

 
$
351.0

 
$
293.2