
	December 31, 2022
(In millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
Debt securities, available-for-sale:
U.S. government agencies (1)	$	1,535.1	$	0.2	$	(4.6)	$	1,530.7
Commercial paper	119.6		—		(0.2)		119.4
Corporate debt	164.3		—		(0.5)		163.8
Supranationals	—		—		—		—
Total debt securities, available-for-sale	$	1,819.0	$	0.2	$	(5.3)	$	1,813.9


	December 31, 2021
(In millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
Debt securities, available-for-sale:
U.S. government agencies	$	1,212.1	$	—	$	(1.5)	$	1,210.6
Commercial paper	189.8		—		(0.1)		189.7
Corporate debt	224.6		—		(0.3)		224.3
Supranationals	54.1		—		(0.1)		54.0
Total debt securities, available-for-sale	$	1,680.6	$	—	$	(2.0)	$	1,678.6

As of December 31, 2022, the estimated market value of our short-term debt securities with contractual maturities up to 12 months was $1.81 billion. As of December 31, 2021, the estimated market value of our short-term debt securities with contractual maturities up to 12 months and up to 18 months was $1.36 billion and $320.7 million, respectively. Gross realized gains and losses on sales of our short-term debt securities for the twelve months ended December 31, 2022, 2021 and 2020 were not significant.

We periodically review our portfolio of debt securities to determine if any investment is impaired due to credit loss or other potential valuation concerns. For debt securities where the fair value of the investment is less than the amortized cost basis, we have assessed at the individual security level for various quantitative factors including, but not limited to, the nature of the investments, changes in credit ratings, interest rate fluctuations, industry analyst reports, and the severity of impairment. Unrealized losses on available-for-sale debt securities at December 31, 2022 were primarily due to increases in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, we have not recorded an allowance for credit losses. We do not intend to sell these investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity.

During the twelve months ended December 31, 2022, 2021 and 2020, we had no unrealized gains or losses recognized during the reporting period on equity investments. Realized gains from the sale of an equity investment were $0.2 million and $11.6 million for the twelve months ended December 31, 2022 and 2021, respectively.

Reserve for prompt payment cash discounts recorded against accounts receivable, excluding allowance for doubtful accounts, was $8.3 million, $13.7 million, $15.9 million as of December 31, 2022, 2021, and 2020, respectively.

During the twelve months ended December 31, 2022, 2021 and 2020, we recorded excess and obsolete inventory charges of $13.9 million, $28.1 million and $24.4 million respectively, in cost of sales as a result of our ongoing assessment of sales demand, inventory on hand for each product and the continuous improvement and innovation of our products.

Prepaid and Other Current Assets


	December 31,
(In millions)	2022		2021
Prepaid expenses	$	48.9	$	39.8
Prepaid inventory	67.8		12.1
Income tax receivables	38.9		2.3
Other current assets	37.0		27.4
Total prepaid and other current assets	$	192.6	$	81.6

Property and Equipment


	December 31,
(In millions)	2022		2021
Land (1)	$	26.9	$	15.6
Building (1)	54.3		49.1
Furniture and fixtures	32.6		30.7
Computer software and hardware	48.8		52.7
Machinery and equipment	449.2		272.9
Leasehold improvements	264.4		251.6
Construction in progress	542.6		360.7
Total cost	1,418.8		1,033.3
Less accumulated depreciation and amortization	(363.2)		(231.5)
Total property and equipment, net	$	1,055.6	$	801.8

Loss on disposal of property and equipment during the twelve months ended December 31, 2022, 2021 and 2020 recorded in operating expenses was $2.2 million, $24.5 million and $13.6 million, respectively.

The following table summarizes the components of gross intangible assets, accumulated amortization, and net intangible asset balances as of December 31, 2022 and December 31, 2021


		December 31, 2022
(Dollars in millions)	Weighted Average Useful Life (in years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Verily intangible asset (1)	5.3	$	152.4	$	(2.4)	$	150.0
Customer relationships	3.3	24.1		(8.7)		15.4
Acquired technology and intellectual property (2)	1.7	14.6		(9.6)		5.0
Trademarks and trade name	3.5	4.2		(1.3)		2.9
Intangibles, other	0.0	0.2		(0.2)		—
Total	4.9	$	195.5	$	(22.2)	$	173.3


		December 31, 2021
(Dollars in millions)	Weighted Average Useful Life (in years)		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount

Customer relationships	4.5		$	22.9	$	(3.5)	$	19.4
Acquired technology and intellectual property	2.7		15.2		(7.1)		8.1
Trademarks and trade name	4.5		4.4		(0.5)		3.9
Intangibles, other	1.1		0.3		(0.2)		0.1
Total	4.0		$	42.8	$	(11.3)	$	31.5


	Twelve Months Ended December 31,
(In millions)	2022		2021		2020
Amortization expense included in cost of sales	$	4.3	$	1.9	$	0.6
Amortization expense included in operating expenses	7.5		3.7		2.5
Total amortization of intangible assets	$	11.8	$	5.6	$	3.1

Other assets were $47.1 million and $10.5 million as of December 31, 2022 and December 31, 2021, respectively. The increase in other assets is primarily due to an increase in long-term equity investments in privately held entities, long-term prepaid assets, and term deposits.

Accounts Payable and Accrued Liabilities


	December 31,
	2022		2021
(In millions)			As Adjusted
Accounts payable trade	$	237.9	$	189.4
Accrued tax, audit, and legal fees	44.8		40.6
Accrued rebates	556.4		260.5
Accrued warranty	12.8		12.9

Contractual obligations	—		15.0
Other accrued liabilities	49.9		54.6
Total accounts payable and accrued liabilities	$	901.8	$	573.0

Warranty costs are reflected in our statements of operations as cost of sales. Reconciliations of our accrued warranty costs for the twelve months ended December 31, 2022, 2021 and 2020 were as follows:


	Twelve Months Ended December 31,
(In millions)	2022		2021		2020
Beginning balance	$	12.9	$	11.7	$	7.4
Charges to costs and expenses	43.0		41.5		41.3
Costs incurred	(43.1)		(40.3)		(37.0)
Ending balance	$	12.8	$	12.9	$	11.7


	December 31,
(In millions)	2022		2021
Finance lease obligations	$	59.6	$	57.0

Deferred revenue, long-term	19.0		16.1
Deferred tax liabilities	4.9		5.9
Other tax liabilities	32.7		2.8
Other liabilities	12.1		8.2
Total other long-term liabilities	$	128.3	$	90.0