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Financial Instruments, Risk Management and Fair Value Measurements Narrative (Details)
MMBTU in Millions, $ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
MMBTU
Dec. 31, 2015
USD ($)
Derivative [Line Items]    
Estimated fair value of debt $ 2,155.8 $ 2,214.0
Carrying value of debt 2,042.1 $ 2,148.9
Designated as Hedging Instrument    
Derivative [Line Items]    
Cash flow hedge gain (loss) to be reclassified within 12 months 3.5  
Cash flow hedge gain (loss) to be reclassified after 12 months 0.0  
Designated as Hedging Instrument | Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount $ 310.0  
Designated as Hedging Instrument | Energy contracts    
Derivative [Line Items]    
Nonmonetary notional amount of price risk cash flow hedge | MMBTU 1.3  
Designated as Hedging Instrument | Foreign Currency and Energy Contracts    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges $ 3.5  
Not Designated as Hedging Instruments | Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount 1,630.0  
Designated as Cash Flow Hedges | Designated as Hedging Instrument | Foreign exchange contracts    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges (3.2)  
Designated as Cash Flow Hedges | Designated as Hedging Instrument | Energy contracts    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges $ (0.3)