Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2021	$ (77.4)	$ (58.4)
Reclassification to the statement of income	0.8
Change in fair value	(0.8)	(15.6)
Change in fair value	6.8
Balance as of March 31, 2022	(69.8)	$ (72.5)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2021	(69.5)
Balance as of March 31, 2022	(70.3)
Cash Flow Hedging | Foreign currency contracts
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2021	(4.4)
Reclassification to the statement of income	0.7
Change in fair value	7.6
Balance as of March 31, 2022	3.9
Retirement Plan and Other Activity
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2021	(3.5)
Reclassification to the statement of income	0.1
Balance as of March 31, 2022	$ (3.4)