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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Hierarchy for Financial Assets
The following table represents our fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of June 30, 2018 (in millions):
 
Fair Value Measurements Using
 
Level 1
 
Level 2
 
Level 3
 
Total
Cash equivalents
$
149.0

 
$
24.9

 
$

 
$
173.9

Equity investment in Tandem Diabetes Care, Inc.
55.1

 

 

 
55.1

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

 
199.4

 

 
199.4

Commercial paper

 
49.3

 

 
49.3

Corporate debt

 
2.1

 

 
2.1

Total debt securities, available for sale
$

 
$
250.8

 
$

 
$
250.8

The following table represents our fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of December 31, 2017 (in millions):
 
Fair Value Measurements Using
 
Level 1
 
Level 2
 
Level 3
 
Total
Cash equivalents
$
306.6

 
$
38.0

 
$

 
$
344.6

Marketable securities, available for sale
 
 
 
 
 
 
 
U.S. government agencies

 
87.3

 

 
87.3

Corporate debt

 
5.1

 

 
5.1

Commercial paper

 
14.7

 

 
14.7

Total marketable securities, available for sale
$

 
$
107.1

 
$

 
$
107.1