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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Hierarchy for Financial Assets

The following table summarizes financial assets that we measured at fair value on a recurring basis as of March 31, 2019, classified in accordance with the fair value hierarchy. We sold the equity investment in Tandem Diabetes Care, Inc. that we held as of December 31, 2018 during the first quarter of 2019.

	Fair Value Measurements Using
(In millions)	Level 1				Level 2				Level 3				Total
Cash equivalents	$	309.9			$	49.6			$	—			$	359.5
Debt securities, available for sale:
U.S. government agencies	—				54.8				—				54.8
Commercial paper	—				3.0				—				3.0
Corporate debt	—				15.1				—				15.1
Total debt securities, available for sale	—				72.9				—				72.9
Total assets measured at fair value on a recurring basis	$	309.9			$	122.5			$	—			$	432.4

The following table summarizes financial assets that we measured at fair value on a recurring basis as of December 31, 2018, classified in accordance with the fair value hierarchy.

	Fair Value Measurements Using
(In millions)	Level 1				Level 2				Level 3				Total
Cash equivalents	$	199.3			$	66.7			$	—			$	266.0
Equity investment in Tandem Diabetes Care, Inc.	38.0				—				—				38.0
Debt securities, available for sale:
U.S. government agencies	—				173.1				—				173.1
Commercial paper	—				36.2				—				36.2
Corporate debt	—				1.3				—				1.3
Total debt securities, available for sale	—				210.6				—				210.6
Total assets measured at fair value on a recurring basis	$	237.3			$	277.3			$	—			$	514.6

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

No definition available.

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