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Debt (Amended Credit Agreement) (Details)
Apr. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
Apr. 30, 2018
AUD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Debt issuance costs   $ 2,878,000     $ 7,612,000
Term loan   786,000,000     794,000,000
Revolver   490,843,000     $ 270,559,000
Long-term debt   2,777,423,000      
Additional increase in borrowing capacity ability   $ 450,000,000      
Weighted average interest rates on outstanding borrowings   4.60% 4.60%    
Revolver          
Debt Instrument [Line Items]          
Revolver   $ 490,800,000      
Additional Revolver          
Debt Instrument [Line Items]          
Borrowing capacity remaining   346,900,000      
Line of Credit          
Debt Instrument [Line Items]          
Long-term debt   1,152,469,000      
Revolving Credit Facility | Line of Credit | Amended Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 900,000,000        
Covenant, total leverage ratio, maximum 6.25     6.25  
Senior secured leverage ratio 3.50     3.50  
Interest coverage ratio 3.00     3.00  
Revolving Credit Facility | Line of Credit | Amended Credit Agreement | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.25%     2.25%  
Term Loan          
Debt Instrument [Line Items]          
Term loan   788,000,000      
Term Loan | Line of Credit | Amended Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 792,000,000        
Term Loan | Line of Credit | Amended Credit Agreement | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.00%     2.00%  
Variable rate, floor 0.75%     0.75%  
Letter of credit          
Debt Instrument [Line Items]          
Long-term debt   62,300,000      
Letter of credit | Line of Credit | Amended Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 275,000,000  
Long-term debt   0      
Letter of credit | Line of Credit | Bank Guarantee And Standby Sub Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 70,600,000 $ 100,000,000    
Accordion | Line of Credit | Amended Credit Agreement          
Debt Instrument [Line Items]          
Accordion feature, increase limit $ 450,000,000