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Debt - Amended Credit Agreement (Details)
Mar. 23, 2017
USD ($)
Mar. 31, 2017
AUD
Mar. 31, 2017
USD ($)
Mar. 23, 2017
AUD
Mar. 23, 2017
USD ($)
Mar. 22, 2017
AUD
Mar. 22, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                
Loan costs     $ 6,959,000         $ 0
Term loan     800,000,000         289,500,000
Revolver     $ 173,680,000         $ 515,000,000
Weighted average interest rate   3.30% 3.30%          
Revolver                
Debt Instrument [Line Items]                
Revolver     $ 173,700,000          
Additional Revolver                
Debt Instrument [Line Items]                
Borrowing capacity increase     672,700,000          
Revolving Credit Facility | Line of Credit | Amended Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity         $ 900,000,000      
Leverage ratio       2.50 2.50      
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 | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate       2.25% 2.25%      
Letter of Credit                
Debt Instrument [Line Items]                
Long-term debt     53,600,000          
Letter of Credit | Line of Credit | Amended Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity | AUD       AUD 275,000,000   AUD 225,000,000    
Loan costs         $ 7,000,000      
Letter of Credit | Line of Credit | Bank Guarantee and Standby Sub Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   AUD 100,000,000 76,400,000.0          
Accordion | Line of Credit | Amended Credit Agreement                
Debt Instrument [Line Items]                
Accordion feature, increase limit $ 450,000,000              
Term Loan                
Debt Instrument [Line Items]                
Term loan     $ 800,000,000          
Term Loan | Line of Credit | Amended Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity         $ 800,000,000   $ 291,000,000  
Term Loan | Line of Credit | Amended Credit Agreement | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate       2.25% 2.25%      
Interest rate       0.75% 0.75%