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Debt - Amended Credit Agreement (Details)
Apr. 30, 2018
USD ($)
Mar. 31, 2019
AUD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 30, 2018
AUD ($)
Apr. 30, 2018
USD ($)
Debt Instrument [Line Items]            
Loan costs     $ 6,472,000 $ 6,826,000    
Term loan     784,000,000 786,000,000    
Revolver     $ 529,904,000 $ 490,843,000    
Weighted average interest rate   4.60% 4.60%      
Revolver            
Debt Instrument [Line Items]            
Revolver     $ 530,000,000      
Additional Revolver            
Debt Instrument [Line Items]            
Borrowing capacity increase     308,000,000      
Revolving Credit Facility | Line of Credit | Amended Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 900,000,000
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     62,000,000      
Letter of Credit | Line of Credit | Amended Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 275,000,000  
Loan costs           $ 1,000,000
Long-term debt     0      
Letter of Credit | Line of Credit | Bank Guarantee and Standby Sub Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 100,000,000 71,000,000      
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     $ 784,000,000      
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 | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate         2.00% 2.00%
Interest rate         0.75% 0.75%