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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