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Debt (Amended Credit Agreement) (Details)
Mar. 23, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD
Mar. 23, 2017
AUD
Mar. 22, 2017
USD ($)
Mar. 22, 2017
AUD
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]              
Debt issuance costs   $ 7,612,000         $ 375,000
Term loan   794,000,000         289,500,000
Revolver   270,559,000         $ 515,000,000
Long-term debt   2,620,269,000          
Additional increase in borrowing capacity ability   $ 450,000,000          
Weighted average interest rates on outstanding borrowings   3.90% 3.90%        
Revolver              
Debt Instrument [Line Items]              
Revolver   $ 270,600,000          
Additional Revolver              
Debt Instrument [Line Items]              
Borrowing capacity remaining   559,300,000          
Line of Credit              
Debt Instrument [Line Items]              
Long-term debt   1,152,729,000          
Revolving Credit Facility | Line of Credit | Amended Credit Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 900,000,000            
Total leverage ratio 2.50     2.50      
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 [Member] | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.25%     2.25%      
Term Loan              
Debt Instrument [Line Items]              
Term loan   794,000,000          
Term Loan | Line of Credit | Amended Credit Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 800,000,000       $ 291,000,000    
Term Loan | Line of Credit | Amended Credit Agreement [Member] | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.25%     2.25%      
Variable rate, floor 0.75%     0.75%      
Letter of credit              
Debt Instrument [Line Items]              
Long-term debt   70,100,000          
Letter of credit | Line of Credit | Amended Credit Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity | AUD       AUD 275,000,000   AUD 225,000,000  
Debt issuance costs $ 7,000,000            
Letter of credit | Line of Credit | Bank Guarantee And Standby Sub Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 78,100,000.0 AUD 100,000,000        
Accordion | Line of Credit | Amended Credit Agreement [Member]              
Debt Instrument [Line Items]              
Accordion feature, increase limit $ 450,000,000