XML 94 R82.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
MMBTU in Millions
Sep. 30, 2018
USD ($)
MMBTU
Dec. 31, 2017
USD ($)
Derivative [Line Items]    
Estimated fair value of debt $ 2,767,700,000 $ 3,250,600,000
Carrying value of debt 2,742,700,000 $ 3,185,600,000
Designated as Cash Flow Hedges | Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount $ 671,400,000  
Designated as Cash Flow Hedges | Energy contracts    
Derivative [Line Items]    
Nonmonetary notional amount of price risk cash flow hedge (in mmBTUs) | MMBTU 0.0  
Designated as Cash Flow Hedges | Foreign Currency and Energy Contracts    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges $ 5,400,000  
Not Designated as Hedging Instruments | Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount 1,071,100,000  
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges 500,000  
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Foreign exchange contracts    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges 4,900,000  
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Interest rate contracts    
Derivative [Line Items]    
Derivative notional amount $ 200,000,000