Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022			$ (87.5)
Reclassification to the statement of income			(25.0)
Change in fair value	$ (16.8)	$ (33.5)	3.5	$ (64.4)
Change in fair value			32.2
Balance as of September 30, 2023	(80.3)		(80.3)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022			(94.8)
Balance as of September 30, 2023	(91.3)		(91.3)
Cash Flow Hedging | Foreign currency contracts
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022			10.5
Reclassification to the statement of income			(25.2)
Change in fair value			28.7
Balance as of September 30, 2023	14.0		14.0
Retirement Plan Activity
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022			(3.2)
Reclassification to the statement of income			0.2
Balance as of September 30, 2023	$ (3.0)		$ (3.0)