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Summary of Significant Accounting Policies Basis - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2021 point | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Property, Plant and Equipment [Line Items] |  |  |  |
Inventory Valuation Reserves |  | $ 10.3 | $ 8.1 |
Accounts Receivable, before Allowance for Credit Loss, Noncurrent |  | 17.0 | 18.3 |
Capitalized Computer Software, Net |  | 139.1 | 80.2 |
Capitalized Computer Software, Amortization |  | 12.4 | 15.2 | $ 10.6
Asset Impairment Charges |  | 0.0 |  |
Advertising Expense |  | $ 41.0 | $ 40.1 | $ 31.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 81,748 | 79,644 | 815
Allegiant Travel Company |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |
Allways Rewards Loyalty Program |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number Of Points Earned For Every Dollar Spent | point | 1 |  |  |
Number Of Points Earned For Every Dollar Spent Over Five Hundred Dollars | point | 2 |  |  |
A320 Series Engine |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Deferred Costs for Heavy Maintenance |  | $ 68.5 | $ 60.6 |
Amortization of Other Deferred Charges |  | $ 55.5 | $ 43.8 | $ 42.1
Minimum | Computer hardware and software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Maximum | Computer hardware and software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years |  |

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