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Borrowings (Australian NAB Corporate Term Loan (AU)) (Narrative) (Details)
$ in Millions
Dec. 29, 2021
AUD ($)
Jun. 09, 2021
USD ($)
Mar. 15, 2019
AUD ($)
Aug. 06, 2021
Revolving Corporate Markets Loan Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 43,000,000.0   $ 66,500,000  
Repayment of debt   $ 20.0    
Interest rate       1.75%
Revolving Corporate Markets Loan Facility, Amended [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 123,000,000.0   $ 5,000,000.0  
Interest rate     1.90%  
Revolving Corporate Markets Loan Facility, Amended [Member] | Scenario, Actual [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 120,000,000.0      
Corporate Loan Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 120,000,000.0  
Corporate Loan Facility [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     80,000,000.0  
Corporate Loan Facility [Member] | Core Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     40,000,000.0  
Bank Guarantee Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 5,000,000.0  
Interest rate     1.85%  
Jindalee, Queensland [Member] | Revolving Corporate Markets Loan Facility [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 3,000,000.0      
Semi-Annual principal payment $ 500,000      
Minimum [Member] | Corporate Loan Facility [Member]        
Debt Instrument [Line Items]        
Spread on variable interest rate     0.85%  
Maximum [Member] | Corporate Loan Facility [Member]        
Debt Instrument [Line Items]        
Spread on variable interest rate     1.30%  
Bank Bill Swap Bid Rate [Member] | Revolving Corporate Markets Loan Facility [Member]        
Debt Instrument [Line Items]        
Spread on variable interest rate     0.95%