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Debt (Credit Agreement) (Details) - USD ($)
12 Months Ended
Aug. 27, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Capitalized loan costs   $ 31,100,000 $ 42,300,000  
Term Loans   786,000,000 794,000,000  
Line of Credit, amount outstanding   490,843,000 270,559,000  
Outstanding balance   2,777,423,000    
Additional increase in borrowing capacity ability   $ 450,000,000    
Weighted average interest rates on outstanding borrowings   4.60%    
Loss on extinguishment of debt   $ 0 $ 0 $ 15,885,000
Term Loan        
Debt Instrument [Line Items]        
Term Loans   788,000,000    
Letter of credit        
Debt Instrument [Line Items]        
Outstanding balance   62,300,000    
Additional Revolver        
Debt Instrument [Line Items]        
Borrowing capacity remaining   346,900,000    
Revolver        
Debt Instrument [Line Items]        
Line of Credit, amount outstanding   $ 490,800,000    
Revolver | LIBOR        
Debt Instrument [Line Items]        
Debt instrument basis spread on variable rate 2.25%      
Term Loan | LIBOR        
Debt Instrument [Line Items]        
Debt instrument basis spread on variable rate 2.50%      
Term Loan | LIBOR | Minimum        
Debt Instrument [Line Items]        
Debt instrument basis spread on variable rate 0.75%