Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Net income	$ 1,381.8	$ 1,125.0	$ 670.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and loss on disposal of property, plant, and equipment, net	160.0	108.6	86.2
Amortization of intangible assets	43.0	14.2	12.9
Loss (gain) on investment, accretion of discounts, and amortization of premiums on investments, net	(6.0)	1.8	21.2
Deferred income taxes	(8.0)	31.9	60.2
Share-based compensation expense	335.8	261.2	209.1
Amortization of contract acquisition assets	13.1	10.6	10.9
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	38.8	(161.3)	(81.4)
Inventory	(360.5)	(279.0)	(115.5)
Prepaids and other assets	(116.9)	(77.7)	(38.9)
Accounts payable	12.3	16.7	14.0
Accrued compensation and employee benefits	57.4	26.2	31.2
Deferred revenue	35.5	54.3	43.7
Other liabilities	11.9	37.1	219.4
Net cash provided by operating activities	1,598.2	1,169.6	1,143.9
Investing activities:
Purchase of investments	(3,346.2)	(2,581.9)	(1,995.0)
Proceeds from sales of investments	107.3	274.0	1,861.3
Proceeds from maturities of investments	2,569.8	1,533.6	703.1
Purchase of property, plant, and equipment and intellectual property	(425.6)	(187.4)	(190.7)
Acquisition of businesses, net of cash	59.7	87.9	0.0
Net cash provided by (used in) investing activities	(1,154.4)	(1,049.6)	378.7
Financing activities:
Proceeds from issuance of common stock relating to employee stock plans	272.8	236.6	415.5
Taxes paid related to net share settlement of equity awards	(159.1)	(120.0)	(56.6)
Repurchase of common stock	(269.5)	0.0	(2,274.0)
Capital contribution from noncontrolling interest	10.0	10.0	2.0
Payment of deferred purchase consideration	(22.6)	(0.3)	0.0
Net cash provided by (used in) financing activities	(168.4)	126.3	(1,913.1)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2.2)	(0.1)	2.1
Net increase (decrease) in cash, cash equivalents, and restricted cash	273.2	246.2	(388.4)
Cash, cash equivalents, and restricted cash, beginning of year	909.4	663.2	1,051.6
Cash, cash equivalents, and restricted cash, end of year	$ 1,182.6	$ 909.4	$ 663.2