Restructuring - Summary of Liabilities Recognized Related to Restructuring Plan (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2021	Dec. 31, 2019
2021 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 38.6
Expenses	$ 9.0	33.2
Cash payments		(39.2)
Foreign currency exchange rate changes		(0.2)
Ending Balance	32.4	32.4
Expense incurred since the start of the Restructuring Plan	165.0	165.0
Expense estimated to be recognized for the Restructuring Plan	185.0	185.0	$ 185.0
2021 Restructuring Plan [Member] | Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		10.5
Expenses	1.0	4.9
Cash payments		(9.5)
Foreign currency exchange rate changes		(0.1)
Ending Balance	5.8	5.8
Expense incurred since the start of the Restructuring Plan	58.0	58.0
Expense estimated to be recognized for the Restructuring Plan	70.0	70.0
2021 Restructuring Plan [Member] | Contract Termination [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		25.0
Expenses	4.5	20.7
Cash payments		(23.4)
Foreign currency exchange rate changes		(0.1)
Ending Balance	22.2	22.2
Expense incurred since the start of the Restructuring Plan	72.5	72.5
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		3.1
Expenses	3.5	7.6
Cash payments		(6.3)
Foreign currency exchange rate changes
Ending Balance	4.4	4.4
Expense incurred since the start of the Restructuring Plan	34.5	34.5
Expense estimated to be recognized for the Restructuring Plan	35.0	35.0
2019 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance		44.3
Expenses	8.1	22.5
Cash payments		(28.2)
Foreign currency exchange rate changes		0.9
Ending Balance	39.5	39.5
Expense incurred since the start of the Restructuring Plan	300.4	300.4
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		28.9
Expenses	3.2	2.1
Cash payments		(2.9)
Foreign currency exchange rate changes		0.9
Ending Balance	29.0	29.0
Expense incurred since the start of the Restructuring Plan	110.4	110.4
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		9.0
Cash payments		(2.5)
Ending Balance	6.5	6.5
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		6.4
Expenses	4.9	20.4
Cash payments		(22.8)
Ending Balance	4.0	4.0
Expense incurred since the start of the Restructuring Plan	155.0	155.0
Expense estimated to be recognized for the Restructuring Plan	$ 180.0	$ 180.0