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Fair Value Measurements And Derivative Instruments (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 20, 2019
Feb. 13, 2019
Dec. 31, 2020
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]              
Effective interest rate     5.10%   5.10%    
Hedging Instruments, Non-derivative, Assets           $ 5,500,000  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax         $ 1,200,000 0  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months         7,400,000 3,500,000  
Repayments of Secured Debt         896,214,000 350,140,000 $ 56,372,000
2018 Term Loan Facility [Member]              
Derivatives, Fair Value [Line Items]              
Repayments of Secured Debt $ 225,000,000 $ 125,000,000     820,000,000    
2018 Term Loan Facility [Member] | Senior Subordinated Notes [Member]              
Derivatives, Fair Value [Line Items]              
Repayments of Secured Debt     $ 500,000,000        
Level 3 [Member]              
Derivatives, Fair Value [Line Items]              
Fair value of long-term debt     1,453,100,000   1,453,100,000 1,812,800,000  
Foreign currency derivatives              
Derivatives, Fair Value [Line Items]              
Unrealized loss         100,000 200,000  
Derivative, notional amount     71,000,000.0   71,000,000.0 78,800,000  
Commodity derivative contracts              
Derivatives, Fair Value [Line Items]              
Unrealized gain         600,000 500,000  
Unrealized loss         2,800,000 4,100,000  
Derivative, notional amount     61,300,000   61,300,000 99,500,000  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax         2,200,000 3,700,000  
Derivative Instruments Not Designated as Hedging Instruments, Loss         400,000    
Derivative Instruments Not Designated as Hedging Instruments, Gain           400,000  
Interest rate swap              
Derivatives, Fair Value [Line Items]              
Unrealized gain on derivatives         0 2,900,000  
Unrealized loss on derivatives         11,900,000 100,000  
Derivative, notional amount     500,000,000   $ 500,000,000    
Derivative, Term of Contract         2 years    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent         $ 11,900,000 $ 2,900,000  
Interest rate swap | Derivatives not designated as hedges:              
Derivatives, Fair Value [Line Items]              
Derivative, notional amount     250,000,000   250,000,000    
Interest rate swap 2              
Derivatives, Fair Value [Line Items]              
Derivative, notional amount     $ 500,000,000   $ 500,000,000    
Derivative, Term of Contract         5 years    
Minimum [Member] | Commodity derivative contracts              
Derivatives, Fair Value [Line Items]              
Derivative, Term of Contract       3 years      
Maximum [Member] | Commodity derivative contracts              
Derivatives, Fair Value [Line Items]              
Derivative, Term of Contract       5 years      
Plan              
Derivatives, Fair Value [Line Items]              
Effective interest rate     4.85%   4.85%