Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022	$ (87.5)
Reclassification to the statement of income	(5.9)
Change in fair value	14.1	$ (0.8)
Change in fair value	18.7
Balance as of March 31, 2023	(74.7)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022	(94.8)
Balance as of March 31, 2023	(80.7)
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	(6.0)
Change in fair value	4.6
Balance as of March 31, 2023	9.1
Retirement Plan Activity
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2022	(3.2)
Reclassification to the statement of income	0.1
Balance as of March 31, 2023	$ (3.1)