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Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2019

Condensed Financial Information Disclosure [Abstract]

Schedule of Short-term Marketable Securities

Short-term marketable securities, consisting of equity securities and debt securities, were as follows as of the dates indicated:  

	December 31, 2019
(In millions)	Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Market Value
Debt securities, available for sale:
U.S. government agencies	$	675.6			$	0.4			$	—			$	676.0
Commercial paper	248.1				0.1				—				248.2
Corporate debt	163.0				—				(0.1		)		162.9
Total debt securities, available for sale	$	1,086.7			$	0.5			$	(0.1	)		$	1,087.1

	December 31, 2018
(In millions)	Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Market Value
Equity investment in Tandem Diabetes Care, Inc	$	2.0			$	36.0			$	—			$	38.0
Debt securities, available for sale:
U.S. government agencies	$	173.2			$	—			$	(0.1	)		$	173.1
Commercial paper	36.2				—				—				36.2
Corporate debt	1.3				—				—				1.3
Total debt securities, available for sale	$	210.7			$	—			$	(0.1	)		$	210.6
Total marketable securities	$	212.7			$	36.0			$	(0.1	)		$	248.6

Schedule of Reconciliation of Net Gain (Loss) Recognized on Equity Securities

The following table reconciles the net gain recognized on equity securities during the twelve months ended December 31, 2019, 2018 and 2017 to the unrealized gain recognized during those periods on equity securities still held at the reporting dates.

	Twelve Months Ended   December 31,
(In millions)	2019				2018				2017
Net gains and losses recognized during the period on equity securities	$	(4.2	)		$	80.1			$	—
Less: Net gains and losses recognized during the period on equity securities sold during the period	4.2				(44.1		)		—
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date	$	—			$	36.0			$	—

Schedule of Accounts Receivable

	December 31,
(In millions)	2019				2018
Accounts receivable	$	292.1			$	233.9
Less allowance for doubtful accounts	(5.8		)		(7.2		)
Total accounts receivable, net	$	286.3			$	226.7

Schedule of Inventory

	December 31,
(In millions)	2019				2018
Raw materials	$	64.9			$	30.8
Work-in-process	11.1				11.2
Finished goods	43.8				28.7
Total inventory	$	119.8			$	70.7

Schedule of Property and Equipment

	December 31,
(In millions)	2019				2018
Building and land	$	15.5			$	6.0
Furniture and fixtures	12.8				9.0
Computer software and hardware	32.7				29.2
Machinery and equipment	130.2				80.7
Leasehold improvements	102.5				80.7
Construction in progress	132.6				57.3
Total cost	426.3				262.9
Less accumulated depreciation and amortization	(105.0		)		(79.8		)
Total property and equipment, net	$	321.3			$	183.1

Schedule of Accounts Payable and Accrued Liabilities

	December 31,
(In millions)	2019				2018
Accounts payable trade	$	102.3			$	75.5
Accrued tax, audit, and legal fees	14.0				11.7
Accrued rebates	93.3				36.1
Accrued warranty	7.4				6.8
Other accrued liabilities	39.4				17.0
Total accounts payable and accrued liabilities	$	256.4			$	147.1

Schedule of Accrued Warranty

Reconciliations of our accrued warranty costs for the twelve months ended December 31, 2019 and 2018 were as follows:

	Twelve Months Ended December 31,
(In millions)	2019				2018
Beginning balance	$	6.8			$	8.8
Charges to costs and expenses	32.7				17.4
Costs incurred	(32.1		)		(19.4		)
Ending balance	$	7.4			$	6.8

Schedule of Other Long-Term Liabilities

	December 31,
(In millions)	2019				2018
Finance lease obligations	$	14.4			$	7.3
Deferred rent	—				9.4
Other liabilities	5.7				3.3
Total other liabilities	$	20.1			$	20.0

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