Commitments and Contingencies - Aircraft-Related Commitments and Financing Arrangements (Details) $ in Millions	Sep. 30, 2022 USD ($) aircraft aircraft_engine	Dec. 31, 2021
Aircraft-Related Secured Debt
Interest Commitments
Interest commitments, remainder of fiscal year	$ 18.9
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	$ 13.6
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	$ 297.1
Committed expenditures, 2023	907.1
Committed expenditures, 2024	1,045.6
Committed expenditures, 2025	1,226.1
Committed expenditures, 2026	1,424.4
Committed expenditures, 2027 and thereafter	862.8
Non-aircraft Related Commitments
Committed Expenditures
Committed expenditures, remainder of fiscal year	74.8
Committed expenditures, 2023	38.2
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	13
Airbus
Unrecorded Unconditional Purchase Obligation [Line Items]
Future aircraft to be received \| aircraft	114
Number of aircraft to be delivered, remainder of fiscal year \| aircraft	6
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	6
Airbus \| 2022 Through 2027
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft without secured financing commitments scheduled for delivery \| aircraft	108
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	$ 8.6
Operating lease payments expected for aircraft to be delivered, 2023	92.7
Operating lease payments expected for aircraft to be delivered, 2024	187.8
Operating lease payments expected for aircraft to be delivered, 2025	216.4
Operating lease payments expected for aircraft to be delivered, 2026	216.4
Operating lease payments expected for aircraft to be delivered, 2027 and thereafter	$ 1,874.8
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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Contractual interest rate for funds borrowed, under the debt agreement.

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