Fair value of financial instruments - Economic Hedges (Details) - Foreign Exchange Contract - Not Designated as Hedging Instrument - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Location, Statement of Income, Balance [Axis]: us-gaap:OtherOperatingIncomeExpenseNet | |||||
| Derivative [Line Items] | |||||
| Gain (loss) on foreign currency contract | $ 5.7 | $ (22.6) | $ 16.1 | $ (35.2) | |
| Level 2 | |||||
| Derivative [Line Items] | |||||
| Fair value of derivative instruments, net | 4.9 | 4.9 | $ (1.1) | ||
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent | Level 2 | |||||
| Derivative [Line Items] | |||||
| Fair value of derivative instruments, liability | (3.0) | (3.0) | (5.3) | ||
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseCurrent | Level 2 | |||||
| Derivative [Line Items] | |||||
| Fair value of derivative instruments, asset | $ 7.9 | $ 7.9 | $ 4.2 | ||