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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
MMBTU in Millions, $ in Millions
3 Months Ended
Sep. 20, 2019
USD ($)
Mar. 31, 2020
USD ($)
MMBTU
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Derivative [Line Items]        
Estimated fair value of debt   $ 3,872.5   $ 3,393.8
Carrying value of debt   3,782.0   $ 3,258.8
Loss on settlement   (12.0) $ 0.0  
Designated as Cash Flow Hedges | Foreign exchange contracts        
Derivative [Line Items]        
Derivative, notional amount   $ 1,129.0    
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]        
Net gains (losses) on cash flow hedges   $ 17.7    
Not Designated as Hedging Instruments | Foreign exchange contracts        
Derivative [Line Items]        
Derivative, notional amount   1,472.0    
Cash Flow Hedging | Designated as Cash Flow Hedges        
Derivative [Line Items]        
Net gains (losses) on cash flow hedges   (4.2)    
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts        
Derivative [Line Items]        
Net gains (losses) on cash flow hedges   18.5    
Cash Flow Hedging | Designated as Cash Flow Hedges | Interest rate contracts        
Derivative [Line Items]        
Derivative, notional amount   $ 300.0    
Loss on settlement $ 83.1