Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,006.5	$ 1,833.2
Short-term investments	1,026.1	752.3
Accounts receivable, net of allowance for doubtful accounts of $5.7 and $7.6 as of December 31, 2017 and 2016, respectively	852.0	1,054.1
Prepaid expenses and other current assets	299.9	332.3
Total current assets	4,184.5	3,971.9
Property and equipment, net	1,021.1	1,063.8
Long-term investments	988.4	1,071.8
Restricted cash and investments	36.1	99.9
Purchased intangible assets, net	128.1	130.2
Goodwill	3,096.2	3,081.7
Other long-term assets	379.4	237.2
Total assets	9,833.8	9,656.5
Current liabilities:
Accounts payable	217.6	221.0
Accrued compensation	186.0	233.6
Deferred revenue	1,030.3	1,032.0
Other accrued liabilities	304.3	249.3
Total current liabilities	1,738.2	1,735.9
Long-term debt	2,136.3	2,133.7
Long-term deferred revenue	509.0	449.1
Long-term income taxes payable	650.6	209.2
Other long-term liabilities	118.8	166.1
Total liabilities	5,152.9	4,694.0
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; 365.5 shares and 381.1 shares issued and outstanding as of December 31, 2017 and 2016, respectively	0.0	0.0
Additional paid-in capital	8,042.1	8,281.6
Accumulated other comprehensive loss	(5.4)	(37.3)
Accumulated deficit	(3,355.8)	(3,281.8)
Total stockholders' equity	4,680.9	4,962.5
Total liabilities and stockholders' equity	$ 9,833.8	$ 9,656.5