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


	June 30, 2023
(In millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
Debt securities, available-for-sale:
U.S. government agencies (1)	$	1,643.1	$	0.5	$	(3.1)	$	1,640.5
Commercial paper	419.9		—		(0.2)		419.7
Corporate debt	381.9		0.1		(0.9)		381.1

Total debt securities, available-for-sale	$	2,444.9	$	0.6	$	(4.2)	$	2,441.3


	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

Total debt securities, available-for-sale	$	1,819.0	$	0.2	$	(5.3)	$	1,813.9

(1) Includes debt obligations issued by U.S. government-sponsored enterprises or U.S. government agencies.

As of June 30, 2023, the estimated market value of our short-term debt securities with contractual maturities up to 12 months was $2.44 billion. 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. Gross realized gains and losses on sales of our short-term debt securities for the three and six months ended June 30, 2023 and June 30, 2022 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


(In millions)	June 30, 2023		December 31, 2022
Raw materials	$	240.4	$	159.0
Work-in-process	36.4		17.2
Finished goods	144.3		130.5
Total inventory	$	421.1	$	306.7


(In millions)	June 30, 2023		December 31, 2022
Prepaid expenses	$	55.0	$	48.9
Prepaid inventory	62.7		67.8
Deferred compensation plan assets	14.4		10.2
Income tax receivables	5.0		38.9
Other current assets	57.9		26.8
Total prepaid and other current assets	$	195.0	$	192.6


(In millions)	June 30, 2023		December 31, 2022
Land and land improvements	$	29.0	$	26.9
Building	139.5		54.3
Furniture and fixtures	34.8		32.6
Computer software and hardware	58.7		48.8
Machinery and equipment	549.6		449.2
Leasehold improvements	273.4		264.4
Construction in progress	420.9		542.6
Total cost	1,505.9		1,418.8
Less accumulated depreciation and amortization	(428.3)		(363.2)
Total property and equipment, net	$	1,077.6	$	1,055.6


(In millions)	June 30, 2023		December 31, 2022
Long-term investments	$	35.0	$	19.0
Long-term deposits	19.1		16.2
Other assets	12.8		11.9
Total other assets	$	66.9	$	47.1


(In millions)	June 30, 2023		December 31, 2022
Accounts payable trade	$	269.1	$	237.9
Accrued tax, audit, and legal fees	60.4		44.8
Accrued rebates	763.6		556.4
Accrued warranty	11.2		12.8

Deferred compensation plan liabilities	14.4		10.2
Other accrued liabilities	37.8		39.7
Total accounts payable and accrued liabilities	$	1,156.5	$	901.8


(In millions)	June 30, 2023		December 31, 2022
Accrued wages, bonus and taxes	$	76.9	$	96.8
Other accrued employee benefits	31.7		37.5
Total accrued payroll and related expenses	$	108.6	$	134.3


(In millions)	June 30, 2023		December 31, 2022
Finance lease obligations	$	58.5	$	59.6

Deferred revenue, long-term	21.4		19.0
Deferred tax liabilities	4.8		4.9
Other tax liabilities	35.9		32.7
Other liabilities	12.5		12.1
Total other long-term liabilities	$	133.1	$	128.3