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Fair value of financial instruments - Net Investment Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Interest expense	$ (66.0)	$ (63.4)	$ (192.4)	$ (181.8)
Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(50.5)		(50.5)			$ (61.3)
$400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Interest expense	(1.3)	$ (1.2)	(4.1)	$ (3.6)
$215 million cross currency swap II \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument					$ 215.0
Other foreign exchange forward swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	145.0		$ 145.0
Weighted average maturity			9 months 18 days
$215 million cross currency swap III \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	215.0		$ 215.0
Weighted average maturity			7 months 6 days
$185 million cross currency swap \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	185.0		$ 185.0
Weighted average maturity			4 years 1 month 6 days
Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(27.0)		$ (27.0)			(34.2)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	0.0		0.0			(0.7)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	0.3		0.3			0.2
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(24.4)		(24.4)			(28.3)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(2.7)		(2.7)			(1.1)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseCurrent \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	2.0		2.0			2.1
Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseCurrent \| $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			0.2
Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseCurrent \| Other foreign exchange forward swaps \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	$ 1.3		$ 1.3			$ 0.5