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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021 and December 31, 2020 were as follows:
March 31, 2021December 31, 2020Fair Value Level Hierarchy
 Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
(in millions)
8.00% senior secured notes
$850.0 $881.8 $850.0 $886.0 Level 3
Fixed-rate term loans1,272.9 1,303.2 1,301.9 1,362.9 Level 3
Unsecured term loans98.7 105.5 73.3 83.1 Level 3
2015-1 EETC Class A 322.6 323.4 322.6 323.4 Level 2
2015-1 EETC Class B 64.0 63.8 64.0 62.5 Level 2
2015-1 EETC Class C86.6 81.7 86.6 77.8 Level 2
2017-1 EETC Class AA207.3 207.9 214.4 207.4 Level 2
2017-1 EETC Class A69.1 67.2 71.5 68.8 Level 2
2017-1 EETC Class B58.2 56.2 60.6 56.2 Level 2
2017-1 EETC Class C85.5 79.9 85.5 76.3 Level 2
Convertible debt175.0 538.2 175.0 380.3 Level 2
Revolving credit facilities180.0 180.0 275.1 275.1 Level 3
Total long-term debt$3,469.9 $3,888.8 $3,580.5 $3,859.9 
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 March 31, 2021
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$1,774.5 $1,774.5 $— $— 
Restricted cash64.0 64.0 — — 
Short-term investment securities106.4 106.4 — — 
Assets held for sale2.3 — — 2.3 
Total assets$1,947.2 $1,944.9 $— $2.3 
Total liabilities$— $— $— $— 

 Fair Value Measurements as of December 31, 2020
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$1,789.7 $1,789.7 $— $— 
Restricted cash71.4 71.4 — — 
Short-term investment securities106.3 106.3 — — 
Assets held for sale2.3 — — 2.3 
Total assets$1,969.7 $1,967.4 $— $2.3 
Total liabilities$— $— $— $—