Commitments and Contingencies - Aircraft-Related Commitments and Financing Arrangements (Details) $ in Millions	Jun. 30, 2022 USD ($) aircraft aircraft_engine	Aug. 31, 2020
Aircraft-Related Secured Debt
Interest Commitments
Interest commitments, remainder of fiscal year	$ 46.2
Interest commitments, 2023	64.6
Interest commitments, 2024	53.3
Interest commitments, 2025	45.8
Interest commitments, 2026	38.3
Interest commitments, 2027 and thereafter	$ 90.3
Secured Debt \| 8.00% Senior Secured Notes Due 2025
Interest Commitments
Stated interest rate percentage	8.00%	8.00%
Non-Aircraft-Related Secured Debt, Unsecured Debt And Convertible Debt
Interest Commitments
Interest commitments, remainder of fiscal year	$ 24.5
Interest commitments, 2023	48.4
Interest commitments, 2024	48.4
Interest commitments, 2025	45.4
Interest commitments, 2026	5.9
Interest commitments, 2027 and thereafter	$ 14.0
A320 and A321
Aircraft Rent Commitments For Future Aircraft Deliveries
Number of delivered aircraft with secured debt financing commitments \| aircraft	73
Aircraft and Related Flight Equipment
Committed Expenditures
Committed expenditures, remainder of fiscal year	$ 507.3
Committed expenditures, 2023	906.9
Committed expenditures, 2024	999.8
Committed expenditures, 2025	1,060.7
Committed expenditures, 2026	1,349.9
Committed expenditures, 2027 and thereafter	872.8
Non-aircraft Related Commitments
Committed Expenditures
Committed expenditures, remainder of fiscal year	34.3
Committed expenditures, 2023	21.7
Committed expenditures, 2024	18.1
Committed expenditures, 2025	18.1
Committed expenditures, 2026	17.5
Committed expenditures, 2027 and thereafter	$ 19.2
PurePower PW1100G-JM Engine
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of spare aircraft engines ordered \| aircraft_engine	14
Airbus
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft	113
Number of aircraft to be delivered, remainder of fiscal year \| aircraft	10
Number of aircraft to be delivered, 2023 \| aircraft	17
Airbus \| Remainder of 2022
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft with secured debt financing commitments scheduled for delivery \| aircraft	10
Airbus \| 2022 Through 2027
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft without secured financing commitments scheduled for delivery \| aircraft	103
Third Party Lessor \| A320 Family
Aircraft Rent Commitments For Future Aircraft Deliveries
Operating lease payments expected for aircraft to be delivered, remainder of fiscal year	$ 18.0
Operating lease payments expected for aircraft to be delivered, 2023	110.8
Operating lease payments expected for aircraft to be delivered, 2024	188.9
Operating lease payments expected for aircraft to be delivered, 2025	217.9
Operating lease payments expected for aircraft to be delivered, 2026	217.9
Operating lease payments expected for aircraft to be delivered, 2027 and thereafter	$ 1,861.5
Third Party Lessor \| 2022 Through 2024 \| A320 and A321
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft	40

Aircraft Rent Commitments For Future Aircraft Deliveries

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