Derivative financial instruments - Change in fair value of the derivative instruments (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Derivative financial instruments | ||||
| Change in fair value of the derivative instruments | $ 1.4 | $ 34.6 | $ 4.5 | $ 16.5 |
| Embedded options within listed bonds | ||||
| Derivative financial instruments | ||||
| Change in fair value of the derivative instruments | $ 1.4 | 4.0 | 4.3 | 10.6 |
| Foreign exchange swaps | ||||
| Derivative financial instruments | ||||
| Change in fair value of the derivative instruments | 30.5 | $ 0.2 | 5.6 | |
| Interest rate caps | ||||
| Derivative financial instruments | ||||
| Change in fair value of the derivative instruments | $ 0.1 | $ 0.3 | ||