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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Cash Flows [Abstract]    
Net income $ 304.0 $ 287.3
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and loss on disposal of property, plant, and equipment 31.6 23.7
Amortization of intangible assets 10.0 2.6
Loss (gain) on investments, accretion, and amortization, net (1.2) 4.7
Deferred income taxes 32.9 37.4
Share-based compensation expense 76.1 57.5
Amortization of contract acquisition asset 2.8 2.7
Changes in operating assets and liabilities, net of effects of acquisition:    
Accounts receivable 134.6 33.0
Inventory (94.0) (66.2)
Prepaids and other assets (62.7) (20.6)
Accounts payable 23.0 8.4
Accrued compensation and employee benefits (68.7) (64.0)
Deferred revenue (0.5) 11.4
Other liabilities (54.7) (37.7)
Net cash provided by operating activities 333.2 280.2
Investing activities:    
Purchase of investments (992.3) (433.7)
Proceeds from sales of investments 44.4 226.6
Proceeds from maturities of investments 755.1 300.8
Purchase of property, plant, and equipment and intellectual property (114.8) (40.1)
Acquisition of businesses, net of cash (1.3) 0.0
Net cash provided by (used in) investing activities (308.9) 53.6
Financing activities:    
Proceeds from issuance of common stock relating to employee stock plans 88.8 86.2
Taxes paid related to net share settlement of equity awards (138.6) (102.5)
Capital contribution from noncontrolling interest 10.0 8.0
Other financing activities (2.0) 0.0
Net cash used in financing activities (41.8) (8.3)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (1.2) 1.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (18.7)  
Net increase (decrease) in cash, cash equivalents, and restricted cash   326.5
Cash, cash equivalents, and restricted cash, beginning of period 909.4 663.2
Cash, cash equivalents, and restricted cash, end of period $ 890.7 $ 989.7