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Commitments and Contingencies - Fixed Maintenance Reserve Payments and Other Commitments (Details)
$ in Millions
Mar. 31, 2016
USD ($)
Fixed Maintenance Reserve Payments, Aircraft and Related Flight Equipment [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year $ 5.6
Unrecorded Unconditional Purchase Obligation, Due in 2017 6.8
Unrecorded Unconditional Purchase Obligation, Due in 2018 5.8
Unrecorded Unconditional Purchase Obligation, Due in 2019 4.2
Unrecorded Unconditional Purchase Obligation, Due in 2020 3.9
Unrecorded Unconditional Purchase Obligation, Due in 2021 and beyond 10.2
Reservation System and Advertising Media [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year 3.7
Unrecorded Unconditional Purchase Obligation, Due in 2017 3.9
Unrecorded Unconditional Purchase Obligation, Due in 2018 2.6
Unrecorded Unconditional Purchase Obligation, Due after Three Years $ 0.0