Special Charges (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) installment	Mar. 31, 2022 USD ($)
JetBlue Merger Agreement
Unusual or Infrequent Item, or Both [Line Items]
Legal, advisory and other fees	$ 7.2
Percentage of target retention award to be paid upon merger failure or abandonment	50.00%
Retention award payments number of installments | installment	2
Retention award recorded	$ 6.7
Frontier Merger Agreement
Unusual or Infrequent Item, or Both [Line Items]
Legal, advisory and other fees		$ 11.1
Retention award recorded		$ 4.5