Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives (Details)

v3.21.2
Fair Value Measurements and Derivatives (Details)
T in Thousands, € in Billions, $ in Billions
6 Months Ended
Jun. 30, 2021
USD ($)
T
Jun. 30, 2021
EUR (€)
T
Dec. 31, 2020
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt $ 14.2    
Fair value of long-term debt in excess of carrying value $ 1.8   $ 2.2
Fuel contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2023    
Projected fuel purchases | T 366 366  
Fuel contracts | Dedesignated as Hedging Instrument      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2022    
Projected fuel purchases | T 206 206  
Foreign currency contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 2.1 € 1.8  
Interest rate contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 0.6