INCOME TAXES - Summary of Tax Credit Carryforwards (Details) $ in Millions	Dec. 31, 2019 USD ($)
Tax credit carryforwards and the related carryforward periods
Carryforward Amount	$ 147.7
Valuation Allowance	(21.8)
Net Tax Benefit	125.9
California research expenditure tax credits \| California \| Research expenditure tax credits \| Carryforward Period Indefinite
Tax credit carryforwards and the related carryforward periods
Carryforward Amount	124.4
Valuation Allowance	0.0
Net Tax Benefit	124.4
Federal research expenditure tax credits \| United States \| Research expenditure tax credits \| Carryforward Period Indefinite
Tax credit carryforwards and the related carryforward periods
Carryforward Amount	1.5
Valuation Allowance	0.0
Net Tax Benefit	1.5
Puerto Rico purchases credit \| Puerto Rico \| Purchases credit \| Carryforward Period Indefinite
Tax credit carryforwards and the related carryforward periods
Carryforward Amount	21.8
Valuation Allowance	(21.8)
Net Tax Benefit	$ 0.0

Represents the amount after allocation of valuation allowances of deferred tax asset attributable to tax credit carryforwards.

No definition available.

+ Details

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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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