Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Cash Flows [Abstract]
Net income	$ 1,066.8	$ 1,381.8	$ 1,125.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and loss on disposal of property, plant, and equipment, net	226.4	160.0	108.6
Amortization of intangible assets	49.8	43.0	14.2
Loss (gain) on investments, accretion of discounts, and amortization of premiums on investments, net	(55.1)	(6.0)	1.8
Deferred income taxes	57.6	(8.0)	31.9
Share-based compensation expense	395.4	335.8	261.2
Amortization of contract acquisition assets	17.1	13.1	10.6
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	5.7	38.8	(161.3)
Inventory	(170.1)	(360.5)	(279.0)
Prepaids and other assets	(111.8)	(116.9)	(77.7)
Accounts payable	(32.3)	12.3	16.7
Accrued compensation and employee benefits	(16.6)	57.4	26.2
Deferred revenue	15.0	35.5	54.3
Other liabilities	36.9	11.9	37.1
Net cash provided by operating activities	1,484.8	1,598.2	1,169.6
Investing activities:
Purchase of investments	(4,292.9)	(3,346.2)	(2,581.9)
Proceeds from sales of investments	800.7	107.3	274.0
Proceeds from maturities of investments	2,930.8	2,569.8	1,533.6
Purchase of property, plant, and equipment and intellectual property	(341.5)	(425.6)	(187.4)
Acquisition of businesses, net of cash	37.7	59.7	87.9
Net cash provided by (used in) investing activities	(940.6)	(1,154.4)	(1,049.6)
Financing activities:
Proceeds from issuance of common stock relating to employee stock plans	308.8	272.8	236.6
Taxes paid related to net share settlement of equity awards	(175.2)	(159.1)	(120.0)
Repurchase of common stock	(134.3)	(269.5)	0.0
Capital contribution from noncontrolling interest	0.0	10.0	10.0
Payment of deferred purchase consideration	(85.0)	(22.6)	(0.3)
Net cash provided by (used in) financing activities	(85.7)	(168.4)	126.3
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2.6)	(2.2)	(0.1)
Net increase (decrease) in cash, cash equivalents, and restricted cash	455.9	273.2	246.2
Cash, cash equivalents, and restricted cash, beginning of year	1,182.6	909.4	663.2
Cash, cash equivalents, and restricted cash, end of year	$ 1,638.5	$ 1,182.6	$ 909.4