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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allocation of stock-based compensation expense
Total stock-based compensation expense	$ 92.6	$ 81.3	$ 71.0
Income tax benefit	(15.4)	(14.8)	(13.4)
Total stock-based compensation expense, net of tax	77.2	66.5	57.6
Cost of sales
Allocation of stock-based compensation expense
Total stock-based compensation expense	17.2	14.7	11.4
Selling, general, and administrative expenses
Allocation of stock-based compensation expense
Total stock-based compensation expense	56.6	51.2	46.3
Research and development expenses
Allocation of stock-based compensation expense
Total stock-based compensation expense	$ 18.8	$ 15.4	$ 13.3

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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