Restructuring - Summary of Liabilities Recognized Related to Restructuring Plan (Detail) - 2025 Restructuring Plan [Member] $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2026 USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 99.6
Expenses incurred (reversed)	$ (0.4)	9.3
Cash payments		(71.7)
Foreign currency exchange rate changes		(1.4)
Ending Balance	35.8	35.8
Expense incurred since the start of the Restructuring Plan	146.1	146.1
Expense estimated to be recognized for the Restructuring Plan	170.0	170.0
Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		91.5
Expenses incurred (reversed)	(1.2)	3.0
Cash payments		(62.1)
Foreign currency exchange rate changes		(1.3)
Ending Balance	31.1	31.1
Expense incurred since the start of the Restructuring Plan	124.3	124.3
Expense estimated to be recognized for the Restructuring Plan	130.0	130.0
Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		5.0
Expenses incurred (reversed)		0.3
Cash payments		(2.8)
Ending Balance	2.5	2.5
Expense incurred since the start of the Restructuring Plan	7.6	7.6
Expense estimated to be recognized for the Restructuring Plan	20.0	20.0
Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		3.1
Expenses incurred (reversed)	0.8	6.0
Cash payments		(6.8)
Foreign currency exchange rate changes		(0.1)
Ending Balance	2.2	2.2
Expense incurred since the start of the Restructuring Plan	14.2	14.2
Expense estimated to be recognized for the Restructuring Plan	$ 20.0	$ 20.0