Restructuring - Summary of Liabilities Recognized Related to Restructuring Plan (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Feb. 28, 2025	Dec. 31, 2023	Dec. 31, 2019
2025 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Expenses	$ 6.5	$ 29.8
Cash payments		(18.5)
Foreign currency exchange rate changes		0.1
Ending Balance	11.4	11.4
Expense incurred since the start of the Restructuring Plan	29.8	29.8
Expense estimated to be recognized for the Restructuring Plan	85.0	85.0	$ 85.0
2025 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Expenses	3.7	26.9
Cash payments		(17.7)
Foreign currency exchange rate changes		0.1
Ending Balance	9.3	9.3
Expense incurred since the start of the Restructuring Plan	26.9	26.9
Expense estimated to be recognized for the Restructuring Plan	75.0	75.0
2025 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Expense estimated to be recognized for the Restructuring Plan	2.0	2.0
2025 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Expenses	2.8	2.9
Cash payments		(0.8)
Ending Balance	2.1	2.1
Expense incurred since the start of the Restructuring Plan	2.9	2.9
Expense estimated to be recognized for the Restructuring Plan	8.0	8.0
2023 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		27.1
Expenses	(0.1)	3.6
Cash payments		(20.5)
Foreign currency exchange rate changes		1.7
Ending Balance	11.9	11.9
Expense incurred since the start of the Restructuring Plan	117.1	117.1
Expense estimated to be recognized for the Restructuring Plan				$ 117.0
2023 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		18.8
Expenses		(0.7)
Cash payments		(11.6)
Foreign currency exchange rate changes		1.3
Ending Balance	7.8	7.8
Expense incurred since the start of the Restructuring Plan	93.1	93.1
2023 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		1.4
Expenses	0.3	2.8
Cash payments		(3.1)
Ending Balance	1.1	1.1
Expense incurred since the start of the Restructuring Plan	5.9	5.9
2023 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		6.9
Expenses	(0.4)	1.5
Cash payments		(5.8)
Foreign currency exchange rate changes		0.4
Ending Balance	3.0	3.0
Expense incurred since the start of the Restructuring Plan	18.1	18.1
2019 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		43.1
Expenses	8.2	17.1
Cash payments		(54.4)
Foreign currency exchange rate changes		3.4
Ending Balance	9.2	9.2
Expense incurred since the start of the Restructuring Plan	384.6	384.6
Expense estimated to be recognized for the Restructuring Plan	400.0	400.0			$ 400.0
2019 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		38.0
Expenses	3.0	7.1
Cash payments		(42.7)
Foreign currency exchange rate changes		3.4
Ending Balance	5.8	5.8
Expense incurred since the start of the Restructuring Plan	159.2	159.2
Expense estimated to be recognized for the Restructuring Plan	160.0	160.0
2019 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		3.8
Cash payments		(1.4)
Ending Balance	2.4	2.4
Expense incurred since the start of the Restructuring Plan	35.0	35.0
Expense estimated to be recognized for the Restructuring Plan	35.0	35.0
2019 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		1.3
Expenses	5.2	10.0
Cash payments		(10.3)
Ending Balance	1.0	1.0
Expense incurred since the start of the Restructuring Plan	190.4	190.4
Expense estimated to be recognized for the Restructuring Plan	$ 205.0	$ 205.0