Long-term debt - current and non-current - Summary of available facilities (Detail) € in Millions, $ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2026 EUR (€)	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CAD ($)	Feb. 16, 2026 EUR (€)	Feb. 16, 2026 USD ($)
Debt Instrument [Line Items]
Nominal Amount				€ 1,100.0	$ 1,339.5
Facility Drawn [Member] \| EUR \| Term Loan B [Member]
Debt Instrument [Line Items]
Nominal Amount	€ 1,100.0
Rate /Margin	2.00%	2.00%	2.00%
Maturity	Nov. 02, 2031
Facility Drawn [Member] \| EUR \| Floor Rate/Margin [Member] \| Term Loan B [Member]
Debt Instrument [Line Items]
Rate /Margin	0.00%	0.00%	0.00%
Facility Drawn [Member] \| USD \| Term Loan B [Member]
Debt Instrument [Line Items]
Nominal Amount \| $		$ 1,339.5
Rate /Margin	1.75%	1.75%	1.75%
Maturity	Nov. 02, 2031
Facility Drawn [Member] \| USD \| Floor Rate/Margin [Member] \| Term Loan B [Member]
Debt Instrument [Line Items]
Rate /Margin	0.00%	0.00%	0.00%
Facility Drawn [Member] \| CAD \| Term Facility [Member]
Debt Instrument [Line Items]
Nominal Amount \| $			$ 49.0
Rate /Margin	1.36%	1.36%	1.36%
Maturity	Sep. 25, 2030
Facility Undrawn [Member] \| EUR \| Revolving Credit Facility (RCF) [Member]
Debt Instrument [Line Items]
Nominal Amount	€ 210.0
Rate /Margin	2.00%	2.00%	2.00%
Maturity	May 02, 2031
Facility Undrawn [Member] \| EUR \| Ancillary Facility – ERSTE Bank [Member]
Debt Instrument [Line Items]
Nominal Amount	€ 40.0
Rate /Margin	2.50%	2.50%	2.50%
Maturity	Jul. 31, 2027
Facility Undrawn [Member] \| EUR \| Ancillary Facility – HELABA [Member]
Debt Instrument [Line Items]
Nominal Amount	€ 50.0
Rate /Margin	2.00%	2.00%	2.00%
Maturity	May 02, 2031