Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives (Detail Textuals)

v3.8.0.1
Fair Value Measurements and Derivatives (Detail Textuals)
Metric_Ton in Millions, $ in Millions, € in Billions
9 Months Ended
Sep. 30, 2017
USD ($)
Metric_Ton
Sep. 30, 2017
EUR (€)
Metric_Ton
Dec. 31, 2016
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt $ 6,796.4   $ 6,525.7
Fair value of long-term debt in excess of carrying value $ 62.0   $ 11.6
Fuel Swaps      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2020    
Projected fuel purchases | Metric_Ton 1.4 1.4  
Foreign Currency Forward Contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 2,100.0 € 1.8  
Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 237.2