Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) aircraft	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) subsidiary	Aug. 07, 2022 hangar aircraft	Apr. 30, 2021 USD ($)	Feb. 28, 2021 USD ($)
Other Commitments [Line Items]
Number of airline subsidiaries | subsidiary			2
Government grant awarded | $			$ 75.8		$ 40.0	$ 37.4
Government grant awarded, increase | $						$ 5.6
Government grants | $		$ (111.7)	$ (47.2)
Right-of-use asset obtained in exchange for operating lease liability | $	$ 34.7	$ 14.7
Operating lease, weighted average discount rate, percent	3.20%	2.40%
Operating lease, weighted average remaining lease, term (in years)	4 years 3 months 18 days	3 years 9 months 18 days
Operating lease, payments | $	$ 23.5	$ 20.5
Contractual obligation | $	715.9
Contractual obligation, to be paid, year one | $	350.9
Number of aircrafts				3
Loss contingency, receivable | $	4.9
Loss contingency, receivable, proceeds | $	$ 2.0
Number of aircraft hangars | hangar				1
Property Leases | Minimum
Other Commitments [Line Items]
Lessee, operating lease, term of contract	1 month
Property Leases | Maximum
Other Commitments [Line Items]
Lessee, operating lease, term of contract	9 years
Equipment Leases | Minimum
Other Commitments [Line Items]
Lessee, operating lease, term of contract	1 month
Equipment Leases | Maximum
Other Commitments [Line Items]
Lessee, operating lease, term of contract	5 years
Aircraft Provided By Customers
Other Commitments [Line Items]
Lessee, number of leased aircraft	13
Aircraft Leased From External Customers
Other Commitments [Line Items]
Lessee, number of leased aircraft	4
Operating
Other Commitments [Line Items]
Number of aircrafts				1
Inoperative
Other Commitments [Line Items]
Number of aircrafts				2
B-767-300
Other Commitments [Line Items]
Number of owned aircrafts	15
Number of aircrafts to be purchased	16
A-321-200
Other Commitments [Line Items]
Number of owned aircrafts	7
Number of aircrafts to be purchased	2
A-330-200
Other Commitments [Line Items]
Number of aircrafts to be purchased	5