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Fair Value Measurements And Derivative Instruments (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Long-term Debt $ 339,374,000 $ 2,156,634,000 $ 339,374,000
Fair value of long-term debt 359,200,000   359,200,000
Hedging Instruments, Non-derivative, Assets 14,800,000 9,500,000 14,800,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax   2,200,000 1,400,000.0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months   7,000,000 100,000
Foreign currency derivatives      
Derivatives, Fair Value [Line Items]      
Unrealized loss   100,000  
Notional amount 18,900,000 19,600,000 18,900,000
Commodity derivative contracts      
Derivatives, Fair Value [Line Items]      
Unrealized gain   300,000 5,300,000
Unrealized loss   11,000,000 600,000
Notional amount $ 143,900,000 142,100,000 143,900,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax   $ (10,700,000) $ 4,700,000
Minimum [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Term of Contract 3 years    
Maximum [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Term of Contract 5 years