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Debt (Amended and Restated Credit Agreement) (Details)
12 Months Ended
Jun. 12, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
AUD ($)
Jun. 12, 2019
AUD ($)
Debt Instrument [Line Items]          
Gain (loss) on extinguishment of debt   $ 5,319,000 $ (4,795,000)    
Long-term debt   2,935,820,000      
Additional increase in borrowing capacity ability   450,000,000.0      
Amended and Restated Credit Agreement          
Debt Instrument [Line Items]          
Gain (loss) on extinguishment of debt $ (1,200,000)        
Debt issuance costs, gross 4,700,000        
Revolver          
Debt Instrument [Line Items]          
Line of credit, amount outstanding   704,400,000      
Additional Revolver          
Debt Instrument [Line Items]          
Borrowing capacity remaining   136,000,000.0      
Line of Credit          
Debt Instrument [Line Items]          
Long-term debt   1,111,339,000      
Line of credit, amount outstanding   704,437,000 520,671,000    
Term loan   $ 770,000,000 $ 778,000,000    
Revolving Credit Facility | Line of Credit | Amended and Restated Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 900,000,000        
Maximum borrowing capacity 6.25       6.25
Maximum borrowing capacity 3.50       3.50
Maximum borrowing capacity 3.00       3.00
Weighted average interest rates on outstanding borrowings   2.58%   2.58%  
Revolving Credit Facility | Line of Credit | Amended and Restated Credit Agreement | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.25%       2.25%
Variable rate, floor 0.00%       0.00%
Term Loan          
Debt Instrument [Line Items]          
Term loan   $ 770,000,000.0      
Term Loan | Line of Credit | Amended and Restated Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 792,000,000.0        
Term Loan | Line of Credit | Amended and Restated 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   59,600,000      
Letter of credit | Revolver | Ravenhall          
Debt Instrument [Line Items]          
Maximum exposure, undiscounted   45,500,000   $ 59,000,000  
Letter of credit | Line of Credit | Amended and Restated 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   $ 77,100,000   100,000,000  
Debt instrument agreement notice period   90 days      
Line of credit, amount outstanding       $ 59,000,000  
Accordion | Line of Credit | Amended and Restated Credit Agreement          
Debt Instrument [Line Items]          
Accordion feature, increase limit $ 450,000,000.0