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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 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 June 30, 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
$
410.7

 
$
126.2

 
$

 
$
536.9

 
 
 
 
 
 
 
 
Debt securities, available for sale:
 
 
 
 
 
 
 
U.S. government agencies

 
531.6

 

 
531.6

Commercial paper

 
98.9

 

 
98.9

Corporate debt

 
37.8

 

 
37.8

Total debt securities, available for sale

 
668.3

 

 
668.3

 
 
 
 
 
 
 
 
Total assets measured at fair value on a recurring basis
$
410.7

 
$
794.5

 
$

 
$
1,205.2

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