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Fair value of financial instruments - Net Investment Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Jul. 26, 2023	Jul. 12, 2022
Derivative [Line Items]
Interest expense	$ 60.9	$ 56.5	$ 118.4	$ 112.3
Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(62.2)		(62.2)		$ (12.8)
$400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Interest expense	1.2	$ 1.2	$ 2.4	$ 2.3
$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			9 months 18 days
$55 million foreign exchange forward swap \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument	55.0		$ 55.0
Weighted average maturity			4 months 24 days
$185 million cross currency swap \| Designated as Hedging Instrument
Derivative [Line Items]
Notional value of derivative instrument							$ 185.0
Weighted average maturity			5 years 2 months 12 days
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		5.7
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	1.6		1.6		0.0
Prepaid expenses and other \| $55 million foreign exchange forward swap \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, asset position	0.3		0.3		0.1
Accrued liabilities \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(35.6)		(35.6)		0.0
Other liabilities \| $400 million cross currency swap 2022 \| Level 2 \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of contract, liability position	(30.6)		(30.6)		(21.7)
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		$ 3.1