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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Cash Flows [Abstract]    
Net income $ 287.3 $ 180.8
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and loss on disposal of property, plant, and equipment 23.7 19.0
Amortization of intangible assets 2.6 3.7
Loss on investments, accretion of discounts, and amortization of premiums on investments, net 4.7 6.1
Deferred income taxes 37.4 30.5
Share-based compensation expense 57.5 47.4
Amortization of contract acquisition asset 2.7 2.7
Changes in operating assets and liabilities:    
Accounts receivable 33.0 16.5
Inventory (66.2) (39.0)
Prepaids and other assets (20.6) 2.8
Accounts payable 8.4 5.5
Accrued compensation and employee benefits (64.0) (50.3)
Deferred revenue 11.4 31.9
Other liabilities (37.7) (16.1)
Net cash provided by operating activities 280.2 241.5
Investing activities:    
Purchase of investments (433.7) (168.2)
Proceeds from sales of investments 226.6 1,421.1
Proceeds from maturities of investments 300.8 108.4
Purchase of property, plant, and equipment and intellectual property (40.1) (53.0)
Net cash provided by investing activities 53.6 1,308.3
Financing activities:    
Proceeds from issuance of common stock relating to employee stock plans 86.2 169.1
Taxes paid related to net share settlement of equity awards (102.5) (47.4)
Repurchase of common stock 0.0 (2,000.0)
Other financing activities 8.0 0.0
Net cash used in financing activities (8.3) (1,878.3)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 1.0 0.5
Net increase (decrease) in cash, cash equivalents, and restricted cash 326.5 (328.0)
Cash, cash equivalents, and restricted cash, beginning of period 663.2 1,051.6
Cash, cash equivalents, and restricted cash, end of period $ 989.7 $ 723.6