Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,036.6	$ 714.6
Short-term investments	1,518.0	845.2
Accounts receivable, net of allowances of $1.9 and $2.1 at December 31, 2016 and 2015, respectively	430.2	394.3
Inventory	182.3	167.9
Prepaids and other current assets	83.3	73.5
Total current assets	3,250.4	2,195.5
Property, plant and equipment, net	458.4	432.1
Long-term investments	2,283.3	1,788.0
Deferred tax assets	150.9	167.8
Intangible and other assets, net	142.8	122.8
Goodwill	201.1	201.1
Total assets	6,486.9	4,907.3
Current liabilities:
Accounts payable	68.5	52.6
Accrued compensation and employee benefits	136.4	117.3
Deferred revenue	240.6	225.6
Other accrued liabilities	151.0	96.4
Total current liabilities	596.5	491.9
Other long-term liabilities	112.6	95.9
Total liabilities	709.1	587.8
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, 2.5 shares authorized, $0.001 par value, issuable in series; no shares issued and outstanding as of December 31, 2016 and December 31, 2015, respectively	0.0	0.0
Common stock, 100.0 shares authorized, $0.001 par value, 38.8 shares and 37.4 shares issued and outstanding as of December 31, 2016 and December 31, 2015, respectively	0.0	0.0
Additional paid-in capital	4,211.8	3,429.8
Retained earnings	1,574.9	899.2
Accumulated other comprehensive loss	(8.9)	(9.5)
Total stockholders’ equity	5,777.8	4,319.5
Total liabilities and stockholders’ equity	$ 6,486.9	$ 4,907.3