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Revolving term credit facility (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 20, 2017 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Credit Facility |  |  |
Revolving term credit facility |  |  |
Maturity period |  | 5 years |
Maximum borrowing capacity |  | $ 1,000.0 |
Amount outstanding |  | 0.0 | $ 0.0
Debt issuance costs capitalised |  | 2.5 | 2.2
Amortization of debt issuance costs |  | 0.9 | 0.6
Standby and administrative fees |  | $ 2.5 | $ 2.2
Credit Facility | Bottom |  |  |
Revolving term credit facility |  |  |
Bankers acceptance period under credit facility |  | 30 days |
Stamping fee (as a percent) |  | 1.20% |
Standby fee (as a percent) |  | 0.24% |
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) |  | 0.20% |
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) |  | 1.20% |
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) |  | 0.20% |
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 |  |
Amount outstanding | $ 0.0 |  |
Number of additional extensions available | item | 2 |  |
Extension period available | 1 year |  |
Standby fee (as a percent) | 0.27% |  |
Debt issuance costs capitalised | $ 0.1 |  |
FNBC Credit Facility | CIBC |  |  |
Revolving term credit facility |  |  |
Spread on variable rate (as a percent) | 0.35% |  |
FNBC Credit Facility | LIBOR |  |  |
Revolving term credit facility |  |  |
Spread on variable rate (as a percent) | 1.35% |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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