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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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