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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities:    
Net income $ 320.9 $ 231.5
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and loss on disposal of property, plant, and equipment 36.0 28.9
Amortization of intangible assets 9.7 12.4
Loss on investments, accretion of discounts and amortization of premiums on investments, net 17.4 11.7
Deferred income taxes 35.8 (4.7)
Income tax benefits from employee stock plans 18.3 17.3
Excess tax benefit from employee stock plans (30.3) (21.3)
Share-based compensation expense 85.3 82.4
Changes in operating assets and liabilities    
Accounts receivable (9.4) (6.4)
Inventory (19.5) (33.8)
Prepaids and other assets (14.5) 18.2
Accounts payable 13.0 (1.4)
Accrued compensation and employee benefits (22.6) (8.6)
Deferred revenue 3.8 2.1
Other liabilities 14.3 (19.5)
Net cash provided by operating activities 458.2 308.8
Investing activities:    
Purchase of investments 1,068.3 598.9
Proceeds from sales of investments 233.1 131.6
Proceeds from maturities of investments 427.1 402.5
Purchase of property, plant and equipment (21.0) (32.8)
Net cash used in investing activities (429.1) (97.6)
Financing activities:    
Proceeds from issuance of common stock relating to employee stock plans 448.5 157.5
Excess tax benefit from employee stock plans 30.3 21.3
Taxes paid related to net share settlement of equity awards (21.8) (10.0)
Repurchase and retirement of common stock (8.1) (64.0)
Net cash provided by financing activities 448.9 104.8
Effect of exchange rate changes on cash and cash equivalents 0.9 (0.9)
Net increase in cash and cash equivalents 478.9 315.1
Cash and cash equivalents, beginning of period 714.6 600.3
Cash and cash equivalents, end of period $ 1,193.5 $ 915.4