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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details)
MMBTU in Millions, $ in Millions
Jun. 30, 2019
USD ($)
MMBTU
Dec. 31, 2018
USD ($)
Derivative [Line Items]    
Estimated fair value of debt $ 3,290.7 $ 2,715.2
Carrying value of debt 3,238.5 $ 2,692.7
Designated as Cash Flow Hedges | Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount $ 1,103.0  
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]    
Cumulative changes in net gain (loss) from cash flow hedges $ 1.4  
Not Designated as Hedging Instruments | Foreign exchange contracts    
Derivative [Line Items]    
Derivative notional amount 1,217.0  
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges 32.9  
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Foreign exchange contracts    
Derivative [Line Items]    
Cumulative changes in net gain (loss) from cash flow hedges 0.2  
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Interest rate contracts    
Derivative [Line Items]    
Derivative notional amount $ 800.0