Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,215.8	$ 2,489.0
Short-term investments	738.0	1,070.1
Accounts receivable, net of allowance for doubtful accounts of $5.5 and $4.9 as of December 31, 2019 and 2018, respectively	879.7	754.6
Prepaid expenses and other current assets	376.3	268.1
Total current assets	3,209.8	4,581.8
Property and equipment, net	830.9	951.7
Operating lease assets	169.7
Long-term investments	589.8	199.0
Purchased intangible assets, net	185.8	118.5
Goodwill	3,337.1	3,108.8
Other long-term assets	514.6	403.5
Total assets	8,837.7	9,363.3
Current liabilities:
Accounts payable	219.5	208.8
Accrued compensation	229.0	221.0
Deferred revenue	812.9	829.3
Short-term portion of long-term debt	0.0	349.9
Other accrued liabilities	282.5	233.5
Total current liabilities	1,543.9	1,842.5
Long-term debt	1,683.9	1,789.1
Long-term deferred revenue	410.5	384.3
Long-term income taxes payable	372.6	404.4
Long-term operating lease liabilities	158.1
Other long-term liabilities	58.1	119.8
Total liabilities	4,227.1	4,540.1
Commitments and contingencies (Note 16)
Stockholders' equity:
Convertible preferred stock, $0.00001 par value; 10.0 shares authorized; none issued and outstanding	0.0	0.0
Common stock, $0.00001 par value; 1,000.0 shares authorized; 335.9 shares and 346.4 shares issued and outstanding as of December 31, 2019 and 2018, respectively	0.0	0.0
Additional paid-in capital	7,370.5	7,672.8
Accumulated other comprehensive loss	(18.5)	(18.2)
Accumulated deficit	(2,741.4)	(2,831.4)
Total stockholders' equity	4,610.6	4,823.2
Total liabilities and stockholders' equity	$ 8,837.7	$ 9,363.3