Accumulated Other Comprehensive Income - Tax Effects on Each Component of Accumulated Other Comprehensive Income Recognized in Statements of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency cumulative translation adjustments, before tax	$ (42.6)	$ (18.2)	$ (38.9)	$ (17.6)
Unrealized cash flow hedge gains , before tax	79.2	0.4	100.2	47.9
Reclassification adjustments on cash flow hedges, before tax	(11.2)	2.8	(16.1)	1.8
Adjustments to prior service cost and unrecognized actuarial assumptions, before tax	3.4	(1.8)	4.7	(0.3)
Total Other Comprehensive Income (Loss)	28.8	(16.8)	49.9	31.8
Foreign currency cumulative translation adjustments, tax	49.5	(4.6)	51.9	15.1
Unrealized cash flow hedge gains, tax	13.6	(1.8)	20.9	5.8
Reclassification adjustments on cash flow hedges, tax	(1.5)	0.5	(2.1)
Adjustments to prior service cost and unrecognized actuarial assumptions, tax	0.8	(0.6)	1.2	0.1
Other Comprehensive Income, tax	62.4	(6.5)	71.9	21.0
Foreign currency cumulative translation adjustments, net of tax	(92.1)	(13.6)	(90.8)	(32.7)
Unrealized cash flow hedge gains, net of tax	65.6	2.2	79.3	42.1
Reclassification adjustments on cash flow hedges, net of tax	(9.7)	2.3	(14.0)	1.8
Adjustments to prior service cost and unrecognized actuarial assumptions, net of tax	2.6	(1.2)	3.5	(0.4)
Total Other Comprehensive Income (Loss)	$ (33.6)	$ (10.3)	$ (22.0)	$ 10.8