Long-term debt (Schedule of borrowings) (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of detailed information about borrowings [line items] | |||
| Current portion of long-term debt | $ 472.1 | $ 0.0 | |
| Long-term debt | 536.5 | 1,107.5 | |
| Total debt | 1,008.6 | 1,107.5 | |
| Senior unsecured notes [Member] | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Current portion of long-term debt | 472.1 | 0.0 | |
| Long-term debt | 538.8 | 1,111.1 | |
| Total debt | 1,010.9 | 1,111.1 | $ 1,190.6 |
| Senior secured revolving credit facilities [Member] | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Long-term debt | (2.3) | (3.6) | |
| Total debt | $ (2.3) | $ (3.6) | $ 96.9 |