Share-based awards - Narrative (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Restricted Share Units (RSUs) | ||
| Compensation Related Costs Share Based Payments Disclosure [Line Items] | ||
| Fair value of stock units vested | $ 80.7 | $ 9.1 |
| Fair value of stock units granted | 108.3 | 151.9 |
| Performance Share Unit (PSUs) | ||
| Compensation Related Costs Share Based Payments Disclosure [Line Items] | ||
| Fair value of stock units vested | $ 0.0 | $ 1.9 |
| Performance Share Unit (PSUs) | Maximum | ||
| Compensation Related Costs Share Based Payments Disclosure [Line Items] | ||
| Stock units to be granted (in shares) | 91,434 | |