Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Carry forward tax losses	$ 38.7	$ 83.7
Employee stock based compensation	34.9	29.2
Deferred revenues	3.5	5.6
Tax credits	29.8	23.9
Unrealized gains on marketable securities, net	29.6	1.2
Accrued employee costs	8.1	10.3
Other	16.3	18.4
Deferred tax assets before valuation allowance	160.9	172.3
Valuation allowance - mainly in respect to carryforward losses	(17.5)	(56.7)
Deferred tax asset	143.4	115.6
Intangible assets	(32.8)	(31.3)
Undistributed earnings of subsidiary	(9.9)	(9.9)
Other	(6.5)	(8.1)
Deferred tax liability	(49.2)	(49.3)
Deferred tax asset, net	$ 94.2	$ 66.3

Deferred tax assets unrealized gains on marketable securities net.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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