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Debt (Australian NAB Corporate Term Loan (AU)) (Narrative) (Details) - AUD ($)
$ in Millions
9 Months Ended
Aug. 06, 2020
Mar. 15, 2019
Dec. 17, 2018
Sep. 30, 2020
Dec. 31, 2019
NAB Australian Corporate Term Loan And Revolver [Member]          
Debt Instrument [Line Items]          
Spread on variable interest rate 1.75%        
Australian NAB Corporate Loan Facility Tier 1 [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 66.5
Spread on variable interest rate     0.95%    
Maturity date       Jun. 30, 2019  
Australian NAB Corporate Loan Facility Tier 2 [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 5.0
Spread on variable interest rate     1.90%    
Australian NAB Corporate Loan Facility Tier 3 [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 120.0      
Maturity date       Dec. 31, 2023  
Australian NAB Corporate Loan Facility Tier 3 [Member] | Bank Guarantee Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 5.0      
Spread on variable interest rate   1.85%      
Australian NAB Corporate Loan Facility Tier 3 [Member] | Core Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 40.0      
Australian NAB Corporate Loan Facility Tier 3 [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 80.0      
Minimum [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member]          
Debt Instrument [Line Items]          
Spread on variable interest rate   0.85%      
Maximum [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member]          
Debt Instrument [Line Items]          
Spread on variable interest rate   1.30%