Commitments and contingent liabilities (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Estimated litigation liability	$ 0.3
Palette Life Sciences AB
Loss Contingencies [Line Items]
Loss contingency accrual	3.5
Italian Parliament Legislation
Loss Contingencies [Line Items]
Loss contingency accrual	15.1
Loss contingency, loss in period	0.9
Loss contingency, estimate of possible loss	23.3
Mexican Federal Tax Administration Service
Loss Contingencies [Line Items]
Loss contingency, loss in period	$ 0.0
Minimum
Loss Contingencies [Line Items]
Estimated time frame over which accrued amounts may be paid out	10 years
Maximum
Loss Contingencies [Line Items]
Estimated time frame over which accrued amounts may be paid out	15 years
Accrued liabilities
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 3.0
Other liability
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 2.1