Derivatives and Financial Instruments - Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 02, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract liabilities	$ (88.3)		$ (88.3)		$ (16.3)
Contingent earn-out liabilities						$ (8.0)
Impairment of intangible assets	0.0	$ 0.0	30.9	$ 0.0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.1		0.1		2.5
Foreign currency contract liabilities	(88.2)		(88.2)		(16.3)
Deferred compensation plan	31.4		31.4		29.4
Contingent earn-out liabilities	(8.0)		(8.0)		(8.0)
Total recurring fair value measurements	(64.8)		(64.8)		9.5
Recurring | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract assets					1.9
Interest rate contract liabilities	(0.1)		(0.1)
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.0		0.0		0.0
Foreign currency contract liabilities	0.0		0.0		0.0
Deferred compensation plan	14.7		14.7		15.0
Contingent earn-out liabilities	0.0		0.0		0.0
Total recurring fair value measurements	14.7		14.7		15.0
Level 1 | Recurring | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract assets					0.0
Interest rate contract liabilities	0.0		0.0
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.1		0.1		2.5
Foreign currency contract liabilities	(88.2)		(88.2)		(16.3)
Deferred compensation plan	0.0		0.0		0.0
Contingent earn-out liabilities	0.0		0.0		0.0
Total recurring fair value measurements	(88.2)		(88.2)		(11.9)
Level 2 | Recurring | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract assets					1.9
Interest rate contract liabilities	(0.1)		(0.1)
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.0		0.0		0.0
Foreign currency contract liabilities	0.0		0.0		0.0
Deferred compensation plan	0.0		0.0		0.0
Contingent earn-out liabilities	(8.0)		(8.0)		(8.0)
Total recurring fair value measurements	(8.0)		(8.0)		(8.0)
Level 3 | Recurring | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract assets					0.0
Interest rate contract liabilities	0.0		0.0
NAV | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract assets	0.0		0.0		0.0
Foreign currency contract liabilities	0.0		0.0		0.0
Deferred compensation plan	16.7		16.7		14.4
Contingent earn-out liabilities	0.0		0.0		0.0
Total recurring fair value measurements	16.7		16.7		14.4
NAV | Recurring | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract assets					$ 0.0
Interest rate contract liabilities	$ 0.0		$ 0.0