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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended
Sep. 20, 2019
USD ($)
Mar. 31, 2021
USD ($)
MMBTU
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Derivative [Line Items]        
Estimated fair value of debt   $ 3,833.3   $ 3,640.0
Carrying value of debt   3,605.8   $ 3,267.8
Loss on settlement   (4.0) $ (12.0)  
Designated as Cash Flow Hedges | Foreign exchange contracts        
Derivative [Line Items]        
Derivative, notional amount   $ 1,598.1    
Designated as Cash Flow Hedges | Energy contracts        
Derivative [Line Items]        
Nonmonetary notional amount of price risk cash flow hedge (in mmBTUs) | MMBTU   0    
Designated as Cash Flow Hedges | Foreign Currency and Energy Contracts        
Derivative [Line Items]        
Net gains (losses) on cash flow hedges   $ 25.9    
Not Designated as Hedging Instruments | Foreign exchange contracts        
Derivative [Line Items]        
Derivative, notional amount   1,790.3    
Cash Flow Hedging | Designated as Cash Flow Hedges        
Derivative [Line Items]        
Net gains (losses) on cash flow hedges   6.3    
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts        
Derivative [Line Items]        
Net gains (losses) on cash flow hedges   25.9    
Cash Flow Hedging | Designated as Cash Flow Hedges | Interest rate contracts        
Derivative [Line Items]        
Derivative, notional amount   $ 100.0    
Loss on settlement $ 83.1