CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,067.5	$ 1,023.0
Marketable investments	143.2	27.8
Accounts receivable, no allowance for 2017 and 2016	251.8	214.5
Inventories, net	114.4	100.0
Other current assets	62.3	59.5
Total current assets	1,639.2	1,424.8
Marketable investments	338.5	2.3
Goodwill and other intangible assets, net	45.7	33.8
Property, plant and equipment, net	521.7	489.3
Deferred tax assets, net	177.9	178.3
Other non-current assets	213.0	197.1
Total assets	2,936.0	2,325.6
Current liabilities:
Accounts payable and accrued expenses	143.3	104.2
Line of credit	250.0
Share tracking awards plan	145.1	194.8
Other current liabilities	251.0	33.5
Total current liabilities	789.4	332.5
Non-current liabilities	57.5	130.9
Total liabilities	846.9	463.4
Commitments and contingencies
Temporary equity	19.2	10.9
Stockholders' equity:
Common stock, par value $.01, 245,000,000 shares authorized, 69,825,916 and 69,340,985 shares issued, and 43,206,700 and 42,965,856 shares outstanding at September 30, 2017 and December 31, 2016, respectively	0.7	0.7
Additional paid-in capital	1,838.6	1,813.5
Accumulated other comprehensive loss	(16.8)	(16.8)
Treasury stock, 26,619,216 and 26,375,129 shares at September 30, 2017 and December 31, 2016, respectively	(2,579.2)	(2,379.6)
Retained earnings	2,826.6	2,433.5
Total stockholders' equity	2,069.9	1,851.3
Total liabilities and stockholders' equity	2,936.0	2,325.6
Preferred stock
Stockholders' equity:
Preferred stock, par value $.01 , no shares issued
Series A junior participating preferred stock
Stockholders' equity:
Preferred stock, par value $.01 , no shares issued