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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2022
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 June 30, 2022 and December 31, 2021 were as follows:
June 30, 2022December 31, 2021Fair Value Level Hierarchy
 Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
(in millions)
8.00% senior secured notes
$510.0 $468.4 $510.0 $530.4 Level 3
Fixed-rate term loans1,159.1 1,041.4 1,223.5 1,262.6 Level 3
Unsecured term loans136.3 111.0 136.3 146.4 Level 3
2015-1 EETC Class A 289.6 271.5 300.6 311.1 Level 2
2015-1 EETC Class B 52.0 50.3 56.0 56.4 Level 2
2015-1 EETC Class C69.5 67.7 75.2 74.0 Level 2
2017-1 EETC Class AA193.3 175.2 200.3 203.3 Level 2
2017-1 EETC Class A64.4 57.4 66.8 65.8 Level 2
2017-1 EETC Class B53.4 47.5 55.8 53.6 Level 2
2017-1 EETC Class C85.5 83.7 85.5 84.1 Level 2
4.75% convertible notes due 2025
25.4 53.3 28.2 55.6 Level 2
1.00% convertible notes due 2026
500.0 452.0 500.0 432.5 Level 2
Total long-term debt$3,138.5 $2,879.4 $3,238.2 $3,275.8 
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, 2022
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$1,197.1 $1,197.1 $— $— 
Restricted cash95.4 95.4 — — 
Short-term investment securities105.9 105.9 — — 
Assets held for sale2.5 — — 2.5 
Total assets$1,400.9 $1,398.4 $— $2.5 
Derivative liability$40.2 $— $40.2 $— 
Total liabilities$40.2 $— $40.2 $— 

 Fair Value Measurements as of December 31, 2021
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$1,333.5 $1,333.5 $— $— 
Restricted cash95.4 95.4 — — 
Short-term investment securities106.3 106.3 — — 
Assets held for sale2.5 — — 2.5 
Total assets$1,537.7 $1,535.2 $— $2.5 
Total liabilities$— $— $— $—