Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives (Detail Textuals)

v3.3.0.814
Fair Value Measurements and Derivatives (Detail Textuals)
€ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Metric_Ton
Sep. 30, 2015
EUR (€)
Metric_Ton
Dec. 31, 2014
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt $ 5,765.7   $ 6,229.1
Fair value of long-term debt in excess of carrying value $ 82.6   $ 45.0
Fuel Swaps      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative maturing date Dec. 31, 2019    
Projected fuel purchases | Metric_Ton 1,400,000 1,400,000  
Fuel Swaps | Not Designated as Hedging Instrument      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Projected fuel purchases | Metric_Ton 40,000 40,000  
Foreign Currency Forward Contracts      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 1,000.0 € 900.0  
Foreign Currency Collar      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives 306.7 € 274.4  
Interest Rate Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notional amount of derivatives $ 1,100.0