Restructuring - Summary of Liabilities Recognized Related to Restructuring Plan (Detail) - 2025 Restructuring Plan [Member] $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning Balance	$ 99.6
Expenses incurred	6.3
Cash payments	(36.2)
Foreign currency exchange rate changes	(0.9)
Ending Balance	68.8
Expense incurred since the start of the Restructuring Plan	143.1
Expense estimated to be recognized for the Restructuring Plan	155.0
Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	91.5
Expenses incurred	2.3
Cash payments	(31.6)
Foreign currency exchange rate changes	(0.9)
Ending Balance	61.3
Expense incurred since the start of the Restructuring Plan	123.6
Expense estimated to be recognized for the Restructuring Plan	130.0
Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	5.0
Expenses incurred	0.3
Cash payments	(0.5)
Ending Balance	4.8
Expense incurred since the start of the Restructuring Plan	7.6
Expense estimated to be recognized for the Restructuring Plan	10.0
Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	3.1
Expenses incurred	3.7
Cash payments	(4.1)
Ending Balance	2.7
Expense incurred since the start of the Restructuring Plan	11.9
Expense estimated to be recognized for the Restructuring Plan	$ 15.0