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Long-term debt - Additional information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Long Term Debt |  |  |
Borrowings | $ 1,658.8 | $ 1,658.8 | $ 1,608.8
Senior unsecured notes - due May 15, 2025 |  |  |
Long Term Debt |  |  |
Borrowings | $ 100.0 | $ 100.0 |
Borrowings, interest rate | 6.375% | 6.375% |
Borrowings, covenant, interest coverage ratio, minimum |  | 2 |
Senior unsecured notes - due July 15, 2027 |  |  |
Long Term Debt |  |  |
Borrowings | $ 400.0 | $ 400.0 |
Borrowings, interest rate | 7.50% | 7.50% |
Borrowings, covenant, interest coverage ratio, minimum |  | 2 |
Borrowings redemption price percentage |  | 100.00% |
Credit Facility |  |  |
Long Term Debt |  |  |
Borrowings | $ 0.0 | $ 0.0 |
Credit facility full interest rate | 2.25% | 2.25% | 3.00%
Standby fees on undrawn amounts under credit facility, Percentage | 0.51% | 0.51% | 0.68%
Issuance of senior unsecured notes, net of transaction costs |  | $ 0.0 |
Letters of credit issued |  | $ 24.1 | $ 46.0
Credit Facility | Bottom of range |  |  |
Long Term Debt |  |  |
The capacity for credit facility | $ 350.0 |  |
Credit facility full interest rate | 1.25% | 1.25% |
Standby fees on undrawn amounts under credit facility, Percentage | 0.51% | 0.51% |
Credit Facility | Top of range |  |  |
Long Term Debt |  |  |
The capacity for credit facility | $ 400.0 |  |
Credit facility full interest rate | 3.75% | 3.75% |
Standby fees on undrawn amounts under credit facility, Percentage | 0.84% | 0.84% |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard -URIDate 2021-03-24 + Details
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