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Effective Income Tax Reconciliation (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income before taxes as reported in the statements of income		$ 970.8	$ 962.4	$ 978.9
Statutory tax rate in Israel		23.00%	23.00%	23.00%
Effect of "Preferred Enterprise" status	[1]	(11.00%)	(11.00%)	(9.00%)
Others, net		1.00%	2.00%	2.00%
Effective tax rate		13.00%	14.00%	16.00%
[1] Basic earnings per share amounts of the benefit resulting from the "Technological preferred or Preferred Enterprise" status $ 0.73 $ 0.66 $ 0.57 Diluted earnings per share amounts of the benefit resulting from the "Technological preferred or Preferred Enterprise" status $ 0.72 $ 0.65 $ 0.56

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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