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Fair value of financial instruments - Narrative (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2026 USD ($)
G4S |
Derivative [Line Items] |
Contingent consideration | $ 24
Foreign Exchange Contract | Not Designated as Hedging Instrument |
Derivative [Line Items] |
Notional value of nonderivative instruments | $ 664
Weighted average maturity | 1 month
$215 million cross currency swap II | Designated as Hedging Instrument |
Derivative [Line Items] |
Notional value of derivative instrument | $ 215
$215 million cross currency swap III | Designated as Hedging Instrument |
Derivative [Line Items] |
Weighted average maturity | 9 months 18 days
Notional value of derivative instrument | $ 215
$150 million interest rate swap | Designated as Hedging Instrument |
Derivative [Line Items] |
Weighted average maturity | 6 months
Notional value of derivative instrument | $ 150

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