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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of assets measured at fair value on a recurring basis
The Company's assets that are measured at fair value on a recurring basis consist of the following:
 
 
 
Fair Value Measurements at Reporting Date Using
As of June 30, 2019
Fair Value
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
Available-for-sale debt securities:
 
 
 
 
 
Corporate bonds
$
3,794.6

 
—

 
$
3,794.6

U.S. government and government agency obligations
119.4

 
—

 
119.4

Sovereign bonds
27.3

 
—

 
27.3

Commercial paper
99.7

 
—

 
99.7

Certificates of deposit
53.8

 
—

 
53.8

Equity securities (unrestricted)
67.0

 
$
67.0

 
—

Equity securities (restricted)
347.0

 
62.2

 
284.8

 
$
4,508.8

 
$
129.2

 
$
4,379.6

 
 
 
 
 
 
As of December 31, 2018
 
 
 
 
 
Available-for-sale debt securities:
 
 
 
 
 
Corporate bonds
$
2,718.4

 
—

 
$
2,718.4

U.S. government and government agency obligations
109.4

 
—

 
109.4

Sovereign bonds
7.6

 
—

 
7.6

Commercial paper
113.8

 
—

 
113.8

Certificates of deposit
60.0

 
—

 
60.0

Equity securities (unrestricted)
43.6

 
$
43.6

 
—

Equity securities (restricted)
44.4

 
—

 
44.4

 
$
3,097.2

 
$
43.6

 
$
3,053.6