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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement of Cash Flows [Abstract]    
Net income $ 833.7 $ 702.4
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and loss on disposal of property, plant, and equipment 76.8 61.4
Amortization of intangible assets 9.7 10.1
Loss on investments, accretion of discounts, and amortization of premiums on investments, net 3.2 16.8
Deferred income taxes 52.3 31.4
Share-based compensation expense 190.8 153.5
Amortization of contract acquisition asset 7.9 8.2
Changes in operating assets and liabilities, net of effects of acquisition:    
Accounts receivable (65.2) (38.7)
Inventory (205.8) (82.7)
Prepaids and other assets (89.3) (17.8)
Accounts payable 13.4 11.9
Accrued compensation and employee benefits (21.5) (11.3)
Deferred revenue 34.7 35.8
Other liabilities (9.2) (69.1)
Net cash provided by operating activities 831.5 811.9
Investing activities:    
Purchase of investments (1,694.0) (1,122.1)
Proceeds from sales of investments 274.0 1,525.6
Proceeds from maturities of investments 1,048.7 450.7
Purchase of property, plant, and equipment and intellectual property (131.9) (159.7)
Acquisition of businesses, net of cash (60.1) 0.0
Net cash provided by (used in) investing activities (563.3) 694.5
Financing activities:    
Proceeds from issuance of common stock relating to employee stock plans 199.6 381.6
Taxes paid related to net share settlement of equity awards (115.0) (53.6)
Repurchase of common stock 0.0 (2,000.0)
Other financing activities 8.0 2.0
Net cash provided by (used in) financing activities 92.6 (1,670.0)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (0.7) 2.0
Net increase (decrease) in cash, cash equivalents, and restricted cash 360.1 (161.6)
Cash, cash equivalents, and restricted cash, beginning of period 663.2 1,051.6
Cash, cash equivalents, and restricted cash, end of period $ 1,023.3 $ 890.0