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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and December 31, 2019 were as follows:
September 30, 2020December 31, 2019Fair Value Level Hierarchy
 Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
(in millions)
8.00% senior secured notes
$841.4 $853.6 $— $— Level 3
Fixed-rate senior term loans 270.9 262.2 296.1 296.4 Level 3
Fixed-rate term loans1,014.5 1,034.7 778.2 823.6 Level 3
Unsecured term loans73.3 77.6 — — Level 3
2015-1 EETC Class A 333.6 299.4 348.6 372.2 Level 2
2015-1 EETC Class B 68.0 60.0 72.0 74.5 Level 2
2015-1 EETC Class C92.4 76.0 98.1 100.5 Level 2
2017-1 EETC Class AA214.4 202.6 228.4 237.0 Level 2
2017-1 EETC Class A71.5 60.4 76.1 78.8 Level 2
2017-1 EETC Class B60.6 48.2 70.6 72.0 Level 2
2017-1 EETC Class C85.5 69.2 85.5 88.0 Level 2
Convertible debt105.2 254.3 — — Level 2
Revolving credit facilities275.1 275.1 160.0 160.0 Level 3
Total long-term debt$3,506.4 $3,573.3 $2,213.6 $2,303.0 
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, 2020
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$1,947.6 $1,947.6 $— $— 
Restricted cash54.8 54.8 — — 
Short-term investment securities106.3 106.3 — — 
Assets held for sale2.3 — — 2.3 
Total assets$2,111.0 $2,108.7 $— $2.3 
Total liabilities$— $— $— $— 

 Fair Value Measurements as of December 31, 2019
 TotalLevel
1		Level
2		Level
3
(in millions)
Cash and cash equivalents$979.0 $979.0 $— $— 
Short-term investment securities105.3 105.3 — — 
Assets held for sale2.3 — — 2.3 
Total assets$1,086.6 $1,084.3 $— $2.3 
Total liabilities$— $— $— $—