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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Carrying Amount and Estimated Fair Value, Long-term Debt The carrying amounts and estimated fair values of the Company's long-term debt at September 30, 2023 and December 31, 2022 were as follows:
September 30, 2023December 31, 2022Fair Value Level Hierarchy
 Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
(in millions)
8.00% senior secured notes
$1,110.0 $1,093.0 $1,110.0 $1,085.0 Level 3
Fixed-rate term loans994.2 912.6 1,094.7 1,003.9 Level 3
Unsecured term loans136.3 116.9 136.3 116.0 Level 3
2015-1 EETC Class A 267.6 239.3 278.6 247.5 Level 2
2015-1 EETC Class B 44.0 42.9 48.0 45.6 Level 2
2015-1 EETC Class C— — 63.8 63.1 Level 2
2017-1 EETC Class AA172.2 149.4 186.3 161.6 Level 2
2017-1 EETC Class A57.4 48.4 62.1 52.3 Level 2
2017-1 EETC Class B48.2 42.8 51.7 44.9 Level 2
2017-1 EETC Class C— — 85.5 85.1 Level 2
4.75% convertible notes due 2025
25.1 43.1 25.4 44.9 Level 2
1.00% convertible notes due 2026
500.0 419.3 500.0 405.1 Level 2
Total long-term debt$3,355.0 $3,107.7 $3,642.4 $3,355.0 
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 September 30, 2023
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$818.3 $818.3 $— $— 
Restricted cash119.4 119.4 — — 
Short-term investment securities110.9 110.9 — — 
Assets held for sale1.9 — — 1.9 
Total assets$1,050.6 $1,048.7 $— $1.9 
Derivative liability$10.8 $— $10.8 $— 
Total liabilities$10.8 $— $10.8 $— 

 Fair Value Measurements as of December 31, 2022
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$1,346.4 $1,346.4 $— $— 
Restricted cash119.4 119.4 — — 
Short-term investment securities107.1 107.1 — — 
Assets held for sale2.5 — — 2.5 
Total assets$1,575.4 $1,572.9 $— $2.5 
Derivative liability$29.2 $— 29.2 $— 
Total liabilities$29.2 $— $29.2 $—