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Borrowings (Australian NAB Corporate Term Loan (AU)) (Narrative) (Details) - AUD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 29, 2020 | Aug. 06, 2020 | Mar. 15, 2019 | Dec. 31, 2020
NAB Australian Corporate Term Loan And Revolver [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 123.0 |  |  |
Spread on variable interest rate |  | 1.75% |  |
Remaining credit after Jindalee has been repaid | 120.0 |  |  |
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 |
Jindalee, Queensland [Member] | NAB Australian Corporate Term Loan And Revolver [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Increased amount of credit line | $ 3.0 |  |  |
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% |

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