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Fair value of financial instruments - Narrative (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2024 | Sep. 30, 2025 | Jul. 26, 2023 | Jul. 12, 2022
G4S |  |  |  |
Derivative [Line Items] |  |  |  |
Contingent consideration |  | $ 24 |  |
Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value of nonderivative instruments |  | $ 773 |  |
Weighted average maturity |  | 1 month |  |
$215 million cross currency swap II | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Weighted average maturity |  | 7 months 6 days |  |
Notional value of derivative instrument |  |  | $ 215 | $ 215
$215 million cross currency swap | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value of derivative instrument |  |  | $ 215 |
Interest Rate Swap | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value of derivative instrument | $ 775 |  |  |
Cash proceeds from termination of interest rate swaps | $ 19 |  |  |
$150 million interest rate swap | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Weighted average maturity |  | 10 months 24 days |  |
Notional value of derivative instrument |  | $ 150 |  |

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