Location of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedging Instruments (Detail) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	$ (160.8)	$ 20.4	$ (152.8)	$ (18.6)
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	(1.7)	2.5	(2.4)	(1.9)
Forward Benchmark Interest Rate Lock
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives	$ (159.1)	$ 17.9	$ (150.4)	$ (16.7)