Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Net income	$ 316.2	$ 304.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and loss on disposal of property, plant, and equipment	51.1	31.6
Amortization of intangible assets	12.3	10.0
Loss (gain) on investments, accretion, and amortization, net	0.2	(1.2)
Deferred income taxes	64.5	32.9
Share-based compensation expense	90.6	76.1
Amortization of contract acquisition assets	4.1	2.8
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	118.2	134.6
Inventory	(65.2)	(94.0)
Prepaids and other assets	(131.9)	(62.7)
Accounts payable	21.9	23.0
Accrued compensation and employee benefits	(95.2)	(68.7)
Deferred revenue	0.8	(0.5)
Other liabilities	(34.8)	(54.7)
Net cash provided by operating activities	352.8	333.2
Investing activities:
Purchase of investments	(690.0)	(992.3)
Proceeds from Sale of Investments	98.2	44.4
Proceeds from maturities of investments	617.6	755.1
Purchase of property, plant, and equipment and intellectual property	(105.2)	(114.8)
Acquisition of businesses, net of cash	(37.7)	(1.3)
Net cash provided by (used in) investing activities	(117.1)	(308.9)
Financing activities:
Proceeds from issuance of common stock relating to employee stock plans	91.3	88.8
Taxes paid related to net share settlement of equity awards	(148.9)	(138.6)
Repurchase of common stock	(100.0)	0.0
Capital contribution from noncontrolling interest	0.0	10.0
Other financing activities	(21.1)	(2.0)
Net cash provided by (used in) financing activities	(178.7)	(41.8)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(0.8)	(1.2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	56.2	(18.7)
Cash, cash equivalents, and restricted cash, beginning of period	1,182.6	909.4
Cash, cash equivalents, and restricted cash, end of period	$ 1,238.8	$ 890.7