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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amount and Estimated Fair Value, Long-term Debt The carrying amounts and estimated fair values of the Company's long-term debt at June 30, 2024 and December 31, 2023 were as follows:
June 30, 2024December 31, 2023Fair Value Level Hierarchy
 Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
(in millions)
8.00% senior secured notes
$1,110.0 $1,114.3 $1,110.0 $1,121.9 Level 3
Fixed-rate term loans1,033.9 1,043.8 1,093.3 1,099.9 Level 3
Unsecured term loans136.3 131.1 136.3 128.3 Level 3
2015-1 EETC Class A 245.6 228.2 256.6 230.8 Level 2
2015-1 EETC Class B — — 40.0 39.4 Level 2
2017-1 EETC Class AA166.2 146.3 172.2 149.6 Level 2
2017-1 EETC Class A55.4 48.0 57.4 48.5 Level 2
2017-1 EETC Class B46.4 40.9 48.2 42.9 Level 2
4.75% convertible notes due 2025
25.1 18.3 25.1 42.3 Level 2
1.00% convertible notes due 2026
500.0 248.8 500.0 349.9 Level 2
Total long-term debt$3,318.9 $3,019.7 $3,439.1 $3,253.5 
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets and liabilities measured at gross fair value on a recurring basis are summarized below:
 Fair Value Measurements as of June 30, 2024
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$724.8 $724.8 $— $— 
Restricted cash120.6 120.6 — — 
Short-term investment securities115.3 115.3 — — 
Total assets$960.7 $960.7 $— $— 
Total liabilities$— $— $— $— 
 Fair Value Measurements as of December 31, 2023
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$865.2 $865.2 $— $— 
Restricted cash119.4 119.4 — — 
Short-term investment securities112.5 112.5 — — 
Total assets$1,097.1 $1,097.1 $— $— 
Derivative liability$11.1 $— 11.1 $— 
Total liabilities$11.1 $— $11.1 $—