Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives (Details)

v3.20.2
Fair Value Measurements and Derivatives (Details)
kT in Thousands, $ in Millions, € in Billions
9 Months Ended
Sep. 30, 2020
EUR (€)
kT
Sep. 30, 2020
USD ($)
kT
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt   $ 12,022.1 $ 6,957.8
Fair value of long-term debt in excess of carrying value   $ 869.5 $ 31.3
Fuel swaps      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2023    
Projected fuel purchases | kT 895 895  
Fuel swaps | Derivatives not designated as hedging instruments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Sep. 30, 2021    
Projected fuel purchases | kT 111 111  
Foreign currency contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives € 1.9 $ 2,200.0  
Interest rate swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives   $ 700.0