Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives (Details)

v3.22.0.1
Fair Value Measurements and Derivatives (Details)
T in Thousands, € in Billions, $ in Billions
12 Months Ended
Dec. 31, 2021
USD ($)
T
Dec. 31, 2021
EUR (€)
T
Dec. 31, 2020
USD ($)
T
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt $ 12.5   $ 14.2
Fair value of long-term debt in excess of carrying value $ (0.1)   $ 2.2
Fuel contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2023    
Projected fuel purchases | T 408 408  
Fuel contracts | Not Designated as Hedging Instrument      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Projected fuel purchases | T     199
Foreign currency contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 2.5 € 2.2  
Interest rate contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 0.2