Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022			$ (87.5)
Reclassification to the statement of income			(8.6)
Change in fair value	$ 6.2	$ (30.1)	20.3	$ (30.9)
Change in fair value			33.0
Balance as of June 30, 2023	(63.1)		(63.1)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022			(94.8)
Balance as of June 30, 2023	(74.5)		(74.5)
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			(8.8)
Change in fair value			12.7
Balance as of June 30, 2023	14.4		14.4
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 June 30, 2023	$ (3.0)		$ (3.0)