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Subsequent events (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2018 | Oct. 18, 2018 | Oct. 17, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Jan. 19, 2018
Amended and restated Cobre Panama Agreement - Fixed Payment Stream |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Amount funded by the company |  |  |  |  | $ 88.4 |  | $ 247.8 |
Cumulative amount funded by the company |  |  |  |  | $ 974.4 |  | $ 974.4 |
FNBC Credit Facility |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Proceeds from draw of Credit Facility |  |  |  |  |  | $ 20.0 |  |
Top | Amended and restated Cobre Panama Agreement - Fixed Payment Stream |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Deposit provided to acquiree |  |  |  |  |  |  |  | $ 1,000.0
Subsequent borrowings under credit facilities | Credit Facility |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Proceeds from draw of Credit Facility |  |  | $ 200.0 | $ 200.0 |  |  |  |
Subsequent borrowings under credit facilities | Credit Facility | 30-day Libor |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Spread on variable rate (as a percent) |  |  | 1.10% |  |  |  |  |
Subsequent borrowings under credit facilities | FNBC Credit Facility |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Proceeds from draw of Credit Facility |  | $ 7.0 |  |  |  |  |  |
Subsequent borrowings under credit facilities | FNBC Credit Facility | 30-day Libor |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Spread on variable rate (as a percent) |  | 1.35% |  |  |  |  |  |
Asset acquisition subsequent to year-end | Amended and restated Cobre Panama Agreement - Fixed Payment Stream |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Amount funded by the company | $ 25.6 |  |  |  |  |  |  |
Cumulative amount funded by the company | 1,000.0 |  |  |  |  |  |  |
Asset acquisition subsequent to year-end | Top | Amended and restated Cobre Panama Agreement - Fixed Payment Stream |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Deposit provided to acquiree | $ 1.0 |  |  |  |  |  |  |

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