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Debt and Other Obligations - Long-term Debt (Details)
$ in Millions
Dec. 31, 2022
USD ($)
aircraft
Nov. 17, 2022
Dec. 31, 2021
USD ($)
Sep. 17, 2020
May 12, 2020
Debt Instrument [Line Items]          
Long-term debt $ 3,642.4   $ 3,238.2    
Less current maturities 346.4   208.2    
Less unamortized discount, net 95.8   54.9    
Total $ 3,200.2   $ 2,975.1    
Aircraft          
Debt Instrument [Line Items]          
Failed aircraft sale leaseback | aircraft 1        
8.00% senior secured notes due in 2025 | 8.00% senior secured notes due in 2025          
Debt Instrument [Line Items]          
Stated interest rate percentage 8.00% 8.00% 8.00% 8.00%  
Long-term debt $ 1,110.0   $ 510.0    
Less unamortized discount, net $ 9.0        
Weighted-average interest rates 8.00%   8.00%    
Fixed-rate term loans due through 2039          
Debt Instrument [Line Items]          
Long-term debt $ 1,094.7   $ 1,223.5    
Weighted-average interest rates 3.52%   3.52%    
Unsecured term loans due through 2031 | Unsecured term loans due through 2031          
Debt Instrument [Line Items]          
Long-term debt $ 136.3   $ 136.3    
Weighted-average interest rates 1.00%   1.00%    
Fixed-rate class A 2015-1 EETC due through 2028          
Debt Instrument [Line Items]          
Long-term debt $ 278.6   $ 300.6    
Weighted-average interest rates 4.10%   4.10%    
Fixed-rate class B 2015-1 EETC due through 2024          
Debt Instrument [Line Items]          
Long-term debt $ 48.0   $ 56.0    
Weighted-average interest rates 4.45%   4.45%    
Fixed-rate class C 2015-1 EETC due through 2023          
Debt Instrument [Line Items]          
Long-term debt $ 63.8   $ 75.2    
Weighted-average interest rates 4.93%   4.93%    
Fixed-rate class AA 2017-1 EETC due through 2030          
Debt Instrument [Line Items]          
Long-term debt $ 186.3   $ 200.3    
Weighted-average interest rates 3.38%   3.38%    
Fixed-rate class A 2017-1 EETC due through 2030          
Debt Instrument [Line Items]          
Long-term debt $ 62.1   $ 66.8    
Weighted-average interest rates 3.65%   3.65%    
Fixed-rate class B 2017-1 EETC due through 2026          
Debt Instrument [Line Items]          
Long-term debt $ 51.7   $ 55.8    
Weighted-average interest rates 3.80%   3.80%    
Fixed-rate class C 2017-1 EETC due through 2023          
Debt Instrument [Line Items]          
Long-term debt $ 85.5   $ 85.5    
Weighted-average interest rates 5.11%   5.11%    
Convertible notes | Convertible notes due in 2025          
Debt Instrument [Line Items]          
Stated interest rate percentage 4.75%       4.75%
Long-term debt $ 25.4   $ 28.2    
Weighted-average interest rates 4.75%   4.75%    
Convertible notes | Convertible notes due in 2026          
Debt Instrument [Line Items]          
Stated interest rate percentage 1.00%        
Long-term debt $ 500.0   $ 500.0    
Less unamortized discount, net 35.5        
Total $ 464.5        
Weighted-average interest rates 1.00%   1.00%