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Financial Instruments, Risk Management and Fair Value Measurements Narrative (Details)
MMBTU in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
MMBTU
Dec. 31, 2015
USD ($)
Derivative [Line Items]    
Estimated fair value of debt $ 2,194.8 $ 2,214.0
Carrying value of debt 2,100.4 $ 2,148.9
Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Cash flow hedge gain (loss) to be reclassified within 12 months 2.8  
Cash flow hedge gain (loss) to be reclassified after 12 months 0.0  
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative notional amount $ 419.0  
Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Derivative [Line Items]    
Nonmonetary notional amount of price risk cash flow hedge | MMBTU 1.9  
Designated as Hedging Instrument [Member] | Foreign Currency and Energy Contracts [Member]    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges $ 2.8  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative notional amount 1,889.0  
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges 1.2  
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Energy contracts [Member]    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges $ 1.6