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Long-term debt - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Long Term Debt [Line Items] |  |  |  |
Borrowings |  | $ 886.9 | $ 886.9 | $ 1,578.0
Senior unsecured notes - due July 15, 2027 |  |  |  |
Long Term Debt [Line Items] |  |  |  |
Borrowings |  | $ 400.0 | $ 400.0 |
Borrowings, interest rate |  | 7.50% | 7.50% |
Borrowings, covenant, interest coverage ratio, minimum |  |  | 2 |
Credit facility |  |  |  |
Long Term Debt [Line Items] |  |  |  |
Borrowing limit |  | $ 400.0 | $ 400.0 |
Amount drawn from the credit facility | $ 100.0 |  |  |
Repayments of non-current borrowings |  | $ 100.0 |  |
Credit facility full interest rate |  | 2.50% | 2.50% | 2.50%
Standby fees on undrawn amounts under credit facility |  | 0.56% | 0.56% | 0.56%
Letters of credit issued |  |  | $ 23.3 | $ 26.7
Credit facility | Bottom of range |  |  |  |
Long Term Debt [Line Items] |  |  |  |
Credit facility full interest rate |  | 1.25% | 1.25% |
Standby fees on undrawn amounts under credit facility |  | 0.51% | 0.51% |
Credit facility | Top of range |  |  |  |
Long Term Debt [Line Items] |  |  |  |
Credit facility full interest rate |  | 3.75% | 3.75% |
Standby fees on undrawn amounts under credit facility |  | 0.84% | 0.84% |

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