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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 20, 2019
USD ($)
Jun. 30, 2020
USD ($)
MMBTU
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
MMBTU
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]            
Estimated fair value of debt   $ 3,805.5   $ 3,805.5   $ 3,393.8
Carrying value of debt   3,533.4   3,533.4   $ 3,258.8
Loss on settlement   5.1 $ 8.9 (6.9) $ 8.9  
Designated as Cash Flow Hedges | Foreign exchange contracts            
Derivative [Line Items]            
Derivative, notional amount   $ 1,067.0   $ 1,067.0    
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   $ 6.4   $ 6.4    
Not Designated as Hedging Instruments | Foreign exchange contracts            
Derivative [Line Items]            
Derivative, notional amount   1,580.0   1,580.0    
Cash Flow Hedging | Designated as Cash Flow Hedges            
Derivative [Line Items]            
Net gains (losses) on cash flow hedges   (3.5)   (3.5)    
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts            
Derivative [Line Items]            
Net gains (losses) on cash flow hedges   6.4   6.4    
Cash Flow Hedging | Designated as Cash Flow Hedges | Interest rate contracts            
Derivative [Line Items]            
Derivative, notional amount   $ 100.0   $ 100.0    
Loss on settlement $ 83.1