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Fair value of financial instruments - Net Investment Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Jul. 26, 2023
Derivative [Line Items]
Interest expense	$ (63.5)	$ (57.5)
Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(54.8)		$ (61.3)
$400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Interest expense	(1.5)	$ (1.2)
$215 million cross currency swap II \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	$ 215.0			$ 215.0
Weighted average maturity	1 month 6 days
$185 million cross currency swap \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	$ 185.0
Weighted average maturity	4 years 6 months
Other foreign exchange forward swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	$ 145.0
Weighted average maturity	1 year
Prepaid expenses and other \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	$ 2.1		2.1
Prepaid expenses and other \| $215 million cross currency swap II \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	0.0		0.2
Prepaid expenses and other \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	0.9		0.5
Accrued liabilities \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(31.2)		(34.2)
Accrued liabilities \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(0.2)		(0.7)
Other liabilities \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(25.1)		(28.3)
Other liabilities \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(1.6)		(1.1)
Other assets \| $215 million cross currency swap II \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	0.0		0.0
Other assets \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	$ 0.3		$ 0.2