Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives (Detail Textuals)

v3.19.3
Fair Value Measurements and Derivatives (Detail Textuals)
kT in Thousands, MT in Millions, $ in Millions, € in Billions
9 Months Ended
Sep. 30, 2019
EUR (€)
MT
kT
Sep. 30, 2019
USD ($)
MT
kT
Dec. 31, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt   $ 6,417.1 $ 6,601.9
Fair value of long-term debt in excess of carrying value   $ 39.3 $ 8.4
Fuel swaps      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2022    
Projected fuel purchases | MT 1.3 1.3  
Fuel swaps | Derivative Contracts Not Designated as Hedging Instruments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2019    
Projected fuel purchases | kT 10 10  
Foreign currency contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives € 2.6 $ 2,800.0  
Interest rate contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives   $ 1,700.0