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Revolving term credit facilities (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 20, 2017 USD ($) item | Mar. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Credit Facility |  |  |  |
Revolving term credit facility |  |  |  |
Term of credit facility |  |  | 5 years |
Maximum borrowing capacity |  |  | $ 1,000.0 |
Amount outstanding |  |  | 0.0 | $ 0.0
Debt issuance costs capitalised |  |  | $ 2.7 | 2.5
Credit Facility | Bottom |  |  |  |
Revolving term credit facility |  |  |  |
Bankers acceptance period under credit facility |  |  | 30 days |
Stamping fee (as a percent) |  |  | 1.10% |
Standby fee (as a percent) |  |  | 0.22% |
Credit Facility | Top |  |  |  |
Revolving term credit facility |  |  |  |
Bankers acceptance period under credit facility |  |  | 180 days |
Stamping fee (as a percent) |  |  | 2.20% |
Standby fee (as a percent) |  |  | 0.44% |
Credit Facility | CIBC | Bottom |  |  |  |
Revolving term credit facility |  |  |  |
Spread on variable rate (as a percent) |  |  | 0.10% |
Credit Facility | CIBC | Top |  |  |  |
Revolving term credit facility |  |  |  |
Spread on variable rate (as a percent) |  |  | 1.20% |
Credit Facility | LIBOR | Bottom |  |  |  |
Revolving term credit facility |  |  |  |
Spread on variable rate (as a percent) |  |  | 1.10% |
Credit Facility | LIBOR | Top |  |  |  |
Revolving term credit facility |  |  |  |
Spread on variable rate (as a percent) |  |  | 2.20% |
Credit Facility | Prime rate | Bottom |  |  |  |
Revolving term credit facility |  |  |  |
Spread on variable rate (as a percent) |  |  | 0.10% |
Credit Facility | Prime rate | Top |  |  |  |
Revolving term credit facility |  |  |  |
Spread on variable rate (as a percent) |  |  | 1.20% |
FNBC Credit Facility |  |  |  |
Revolving term credit facility |  |  |  |
Maturity period | 1 year |  |  |
Maximum borrowing capacity | $ 100.0 |  |  |
Proceeds from draw of Credit Facility |  | $ 20.0 |  |
Repayment of credit facility |  | $ 20.0 |  |
Amount outstanding |  |  | $ 0.0 | 0.0
Number of additional extensions available | item | 1 |  |  |
Extension period available | 1 year |  |  |
Debt issuance costs capitalised |  |  | $ 0.1 | $ 0.1

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