Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 779.1	$ 213.7
Short-term investments	65.3	162.4
Accounts receivable trade, less allowance for credit losses of $4.6 and $3.8	78.0	69.3
Inventories	103.7	101.0
Prepaid expenses and other current assets	59.6	44.6
Total current assets	1,085.7	591.0
Long-term investments	23.5	58.4
Property, plant and equipment, net	423.2	399.4
Other intangible assets, net	10.9	13.2
Goodwill	39.6	39.8
Other assets	43.8	41.1
Total assets	1,626.7	1,142.9
Current Liabilities
Accounts payable	35.6	54.5
Accrued expenses and other current liabilities	98.8	103.2
Total current liabilities	134.4	157.7
Convertible debt, net	910.2	887.9
Other liabilities	18.8	21.4
Total liabilities	1,063.4	1,067.0
Commitments and contingencies (Note 9)
Stockholders’ Equity
Preferred stock, $.001 par value, 5,000,000 authorized; none issued and outstanding	0.0	0.0
Common stock, $.001 par value, 100,000,000 authorized; 65,604,347 and 62,685,492 issued and outstanding	0.1	0.1
Additional paid-in capital	1,227.6	749.0
Accumulated deficit	(660.8)	(672.0)
Accumulated other comprehensive loss	(3.6)	(1.2)
Total stockholders’ equity	563.3	75.9
Total liabilities and stockholders’ equity	$ 1,626.7	$ 1,142.9