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Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2020

Condensed Financial Information Disclosure [Abstract]

Schedule of Short-term Marketable Securities

Short-term marketable securities, consisting of debt securities, were as follows as of the dates indicated:

			December 31, 2020
(In millions)			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Estimated Market Value
Debt securities, available for sale:
U.S. government agencies			$	1,570.4					$	0.1					$	(0.1)					$	1,570.4
Commercial paper			258.7						0.1						—						258.8
Corporate debt			60.9						—						—						60.9
Total debt securities, available for sale			$	1,890.0					$	0.2					$	(0.1)					$	1,890.1

			December 31, 2019
(In millions)			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Estimated Market Value
Debt securities, available for sale:
U.S. government agencies			$	675.6					$	0.4					$	—					$	676.0
Commercial paper			248.1						0.1						—						248.2
Corporate debt			163.0						—						(0.1)						162.9
Total debt securities, available for sale			$	1,086.7					$	0.5					$	(0.1)					$	1,087.1

Schedule of Reconciliation of Net Gain (Loss) Recognized on Equity Securities

The following table reconciles the net gain recognized on marketable equity securities during the twelve months ended December 31, 2020, 2019 and 2018 to the unrealized gain recognized during those periods on equity securities still held at the reporting dates.

			Twelve Months Ended   December 31,
(In millions)			2020						2019						2018
Net gains and losses recognized during the period on equity securities			$	—					$	(4.2)					$	80.1
Less: Net gains and losses recognized during the period on equity securities sold during the period			—						4.2						(44.1)
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date			$	—					$	—					$	36.0

Schedule of Accounts Receivable

			December 31,
(In millions)			2020						2019
Accounts receivable			$	435.7					$	292.1
Less allowance for doubtful accounts			(7.2)						(5.8)
Total accounts receivable, net			$	428.5					$	286.3

Schedule of Inventory

			December 31,
(In millions)			2020						2019
Raw materials			$	69.9					$	64.9
Work-in-process			14.2						11.1
Finished goods			150.6						43.8
Total inventory			$	234.7					$	119.8

Schedule of Property and Equipment

			December 31,
(In millions)			2020						2019
Land (1)			$	15.6					$	—
Building (1)			49.2						15.5
Furniture and fixtures			15.3						12.8
Computer software and hardware			35.7						32.7
Machinery and equipment			198.9						130.2
Leasehold improvements			135.8						102.5
Construction in progress			219.0						132.6
Total cost			669.5						426.3
Less accumulated depreciation and amortization			(154.2)						(105.0)
Total property and equipment, net			$	515.3					$	321.3

(1) Represents our finance lease right-of-use assets.

Schedule of Accounts Payable and Accrued Liabilities

			December 31,
(In millions)			2020						2019
Accounts payable trade			$	163.3					$	102.3
Accrued tax, audit, and legal fees			15.3						14.0
Accrued rebates			247.0						93.3
Accrued warranty			11.7						7.4
Other accrued liabilities			43.8						39.4
Total accounts payable and accrued liabilities			$	481.1					$	256.4

Schedule of Accrued Warranty

Reconciliations of our accrued warranty costs for the twelve months ended December 31, 2020 and 2019 were as follows:

			Twelve Months Ended December 31,
(In millions)			2020						2019
Beginning balance			$	7.4					$	6.8
Charges to costs and expenses			41.3						32.7
Costs incurred			(37.0)						(32.1)
Ending balance			$	11.7					$	7.4

Schedule of Other Long-Term Liabilities

			December 31,
(In millions)			2020						2019
Finance lease obligations			$	54.0					$	14.4
Contractual obligations			12.6						—
Other liabilities			14.3						5.7
Total other liabilities			$	80.9					$	20.1

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