Restructuring - Summary of Liabilities Recognized Related to Restructuring Plan (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2021	Dec. 31, 2019
2023 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 14.2
Expenses	$ 14.5	94.0
Cash payments		(56.8)
Foreign currency exchange rate changes		(1.1)
Non-cash activity		1.5
Ending Balance	51.8	51.8
Expense incurred since the start of the Restructuring Plan	106.9	106.9
Expense estimated to be recognized for the Restructuring Plan	120.0	120.0	$ 120.0
2023 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		9.2
Expenses	10.1	81.1
Cash payments		(46.1)
Foreign currency exchange rate changes		(1.0)
Ending Balance	43.2	43.2
Expense incurred since the start of the Restructuring Plan	90.3	90.3
Expense estimated to be recognized for the Restructuring Plan	92.0	92.0
2023 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Expenses	1.2	3.0
Cash payments		(0.5)
Ending Balance	2.5	2.5
Expense incurred since the start of the Restructuring Plan	3.0	3.0
Expense estimated to be recognized for the Restructuring Plan	10.0	10.0
2023 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		5.0
Expenses	3.2	9.9
Cash payments		(10.2)
Foreign currency exchange rate changes		(0.1)
Non-cash activity		1.5
Ending Balance	6.1	6.1
Expense incurred since the start of the Restructuring Plan	13.6	13.6
Expense estimated to be recognized for the Restructuring Plan	18.0	18.0
2021 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		24.7
Expenses	0.3	1.2
Cash payments		(11.1)
Foreign currency exchange rate changes		(0.5)
Ending Balance	14.3	14.3
Expense incurred since the start of the Restructuring Plan	170.3	170.3
Expense estimated to be recognized for the Restructuring Plan	180.0	180.0		$ 180.0
2021 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		4.2
Expenses	(0.7)	(1.1)
Cash payments		(1.1)
Foreign currency exchange rate changes		(0.1)
Ending Balance	1.9	1.9
Expense incurred since the start of the Restructuring Plan	58.0	58.0
Expense estimated to be recognized for the Restructuring Plan	60.0	60.0
2021 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		17.6
Expenses	0.1	0.1
Cash payments		(7.5)
Foreign currency exchange rate changes		(0.4)
Ending Balance	9.8	9.8
Expense incurred since the start of the Restructuring Plan	73.9	73.9
Expense estimated to be recognized for the Restructuring Plan	80.0	80.0
2021 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		2.9
Expenses	0.9	2.2
Cash payments		(2.5)
Ending Balance	2.6	2.6
Expense incurred since the start of the Restructuring Plan	38.4	38.4
Expense estimated to be recognized for the Restructuring Plan	40.0	40.0
2019 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		52.3
Expenses	4.7	21.7
Cash payments		(20.5)
Foreign currency exchange rate changes		(0.4)
Ending Balance	53.1	53.1
Expense incurred since the start of the Restructuring Plan	341.1	341.1
Expense estimated to be recognized for the Restructuring Plan	370.0	370.0			$ 370.0
2019 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		43.8
Expenses	1.5	16.2
Cash payments		(13.2)
Foreign currency exchange rate changes		(0.4)
Ending Balance	46.4	46.4
Expense incurred since the start of the Restructuring Plan	141.9	141.9
Expense estimated to be recognized for the Restructuring Plan	155.0	155.0
2019 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		5.6
Cash payments		(1.0)
Ending Balance	4.6	4.6
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		2.9
Expenses	3.2	5.5
Cash payments		(6.3)
Ending Balance	2.1	2.1
Expense incurred since the start of the Restructuring Plan	164.2	164.2
Expense estimated to be recognized for the Restructuring Plan	$ 180.0	$ 180.0