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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]      
Net income $ 1,125.0 $ 670.9 $ 738.3
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and loss on disposal of property, plant, and equipment, net 108.6 86.2 73.9
Amortization of intangible assets 14.2 12.9 18.2
Loss on investment, accretion of discounts, and amortization of premiums on investments, net 1.8 21.2 35.9
Deferred income taxes 31.9 60.2 20.9
Income tax benefits from employee stock plans 0.0 0.0 29.8
Share-based compensation expense 261.2 209.1 177.6
Amortization of contract acquisition asset 10.6 10.9 10.1
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable (161.3) (81.4) (34.2)
Inventory (279.0) (115.5) (46.7)
Prepaids and other assets (77.7) (38.9) (39.2)
Accounts payable 16.7 14.0 15.9
Accrued compensation and employee benefits 26.2 31.2 18.7
Deferred revenue 54.3 43.7 14.1
Other liabilities 37.1 219.4 53.7
Net cash provided by operating activities 1,169.6 1,143.9 1,087.0
Investing activities:      
Purchase of investments (2,581.9) (1,995.0) (2,585.5)
Proceeds from sales of investments 274.0 1,861.3 389.9
Proceeds from maturities of investments 1,533.6 703.1 970.1
Purchase of property, plant and equipment, and intellectual property (187.4) (190.7) (53.9)
Acquisition of businesses, net of cash 87.9 0.0 0.0
Net cash provided by (used in) investing activities (1,049.6) 378.7 (1,279.4)
Financing activities:      
Proceeds from issuance of common stock relating to employee stock plans 236.6 415.5 580.9
Taxes paid related to net share settlement of equity awards (120.0) (56.6) (24.0)
Repurchase common stock 0.0 (2,274.0) (42.5)
Other financing activities 9.7 2.0 0.0
Net cash provided by (used in) financing activities 126.3 (1,913.1) 514.4
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (0.1) 2.1 0.0
Net increase (decrease) in cash, cash equivalents, and restricted cash 246.2 (388.4) 322.0
Cash, cash equivalents, and restricted cash, beginning of year 663.2 1,051.6 729.6
Cash, cash equivalents, and restricted cash, end of year $ 909.4 $ 663.2 $ 1,051.6