Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,361.9	$ 1,215.8
Short-term investments	412.1	738.0
Accounts receivable, net of allowance for doubtful accounts of $9.9 and $5.5 as of December 31, 2020 and 2019, respectively	964.1	879.7
Prepaid expenses and other current assets	533.1	376.3
Total current assets	3,271.2	3,209.8
Property and equipment, net	762.3	830.9
Operating lease assets	184.6	169.7
Long-term investments	656.6	589.8
Purchased intangible assets, net	266.7	185.8
Goodwill	3,669.6	3,337.1
Other long-term assets	567.3	514.6
Total assets	9,378.3	8,837.7
Current liabilities:
Accounts payable	277.0	219.5
Accrued compensation	270.7	229.0
Deferred revenue	867.3	812.9
Short-term portion of long-term debt	421.5	0.0
Other accrued liabilities	324.6	282.5
Total current liabilities	2,161.1	1,543.9
Long-term debt	1,705.8	1,683.9
Long-term deferred revenue	418.5	410.5
Long-term income taxes payable	312.5	372.6
Long-term operating lease liabilities	163.5	158.1
Other long-term liabilities	73.4	58.1
Total liabilities	4,834.8	4,227.1
Commitments and contingencies (Note 15)
Stockholders' equity:
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; 327.7 shares and 335.9 shares issued and outstanding as of December 31, 2020 and 2019, respectively	0.0	0.0
Additional paid-in capital	7,156.9	7,370.5
Accumulated other comprehensive income (loss)	55.6	(18.5)
Accumulated deficit	(2,669.0)	(2,741.4)
Total stockholders' equity	4,543.5	4,610.6
Total liabilities and stockholders' equity	$ 9,378.3	$ 8,837.7