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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Statement of Cash Flows [Abstract]    
Net income $ 541.9 $ 403.8
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and loss on disposal of property, plant, and equipment 49.8 39.6
Amortization of intangible assets 5.7 7.0
Loss on investments, accretion of discounts, and amortization of premiums on investments, net 4.7 11.4
Deferred income taxes 48.7 35.5
Share-based compensation expense 120.8 97.8
Amortization of contract acquisition asset 5.3 5.5
Changes in operating assets and liabilities, net of effects of acquisition:    
Accounts receivable (17.3) (51.4)
Inventory (133.9) (58.3)
Prepaids and other assets (102.4) (47.9)
Accounts payable 14.3 5.7
Accrued compensation and employee benefits (39.6) (24.9)
Deferred revenue 29.8 40.3
Other liabilities (16.1) (6.1)
Net cash provided by operating activities 511.7 458.0
Investing activities:    
Purchase of investments (851.6) (707.0)
Proceeds from sales of investments 259.0 1,474.9
Proceeds from maturities of investments 724.9 294.9
Purchase of property, plant, and equipment and intellectual property (84.9) (108.3)
Payments to Acquire Businesses, Net of Cash Acquired (38.1) 0.0
Net cash provided by investing activities 9.3 954.5
Financing activities:    
Proceeds from issuance of common stock relating to employee stock plans 134.9 296.4
Taxes paid related to net share settlement of equity awards (108.0) (50.0)
Repurchase of common stock 0.0 (2,000.0)
Other financing activities 8.0 0.0
Net cash provided by (used in) financing activities 34.9 (1,753.6)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (0.6) 1.0
Net increase (decrease) in cash, cash equivalents, and restricted cash 555.3 (340.1)
Cash, cash equivalents, and restricted cash, beginning of period 663.2 1,051.6
Cash, cash equivalents, and restricted cash, end of period $ 1,218.5 $ 711.5