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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Revenue Recognition [Abstract]        
Contract with Customer, Liability, Forward Bookings   39410000000.00%    
Contract with Customer, Liability, Credit Voucher Bookings   5850000000.00%    
Revenue, Performance Obligation, Description of Timing   12 months    
Air Traffic Liability, Recognized     $ 307.5  
Contract with Customer, Liability, Passenger Revenue   56.00%    
Credit Voucher Term Expiration 2 years      
Points Liability   $ 23.2   $ 10.3