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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 20, 2019
USD ($)
Sep. 30, 2020
USD ($)
MMBTU
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
MMBTU
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]            
Estimated fair value of debt   $ 3,554.2   $ 3,554.2   $ 3,393.8
Carrying value of debt   3,222.4   3,222.4   $ 3,258.8
Loss on settlement   3.9 $ 8.2 (3.0) $ 17.1  
Designated as Cash Flow Hedges | Foreign exchange contracts            
Derivative [Line Items]            
Derivative, notional amount   $ 1,218.0   $ 1,218.0    
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   $ 10.3   $ 10.3    
Not Designated as Hedging Instruments | Foreign exchange contracts            
Derivative [Line Items]            
Derivative, notional amount   1,834.0   1,834.0    
Cash Flow Hedging | Designated as Cash Flow Hedges            
Derivative [Line Items]            
Net gains (losses) on cash flow hedges   (2.7)   (2.7)    
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts            
Derivative [Line Items]            
Net gains (losses) on cash flow hedges   11.8   11.8    
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