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Investments (Tables)
 9 Months Ended
Sep. 30, 2021
Investments Debt And Equity Securities [Abstract]  
Gross Unrealized Gains and (Losses) Aggregated by Investment Category

The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:

 

As of September 30, 2021:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Short-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Time deposits and certificates of deposit

 

$

24.0

 

 

$

—

 

 

$

—

 

 

$

24.0

 

Bankers’ acceptance drafts

 

 

2.5

 

 

 

—

 

 

 

—

 

 

 

2.5

 

Commercial paper

 

 

86.2

 

 

 

—

 

 

 

—

 

 

 

86.2

 

Corporate obligations

 

 

35.3

 

 

 

—

 

 

 

—

 

 

 

35.3

 

U.S. treasury obligations

 

 

98.3

 

 

 

—

 

 

 

—

 

 

 

98.3

 

 

 

$

246.3

 

 

$

—

 

 

$

—

 

 

$

246.3

 

 

 

As of September 30, 2021:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Long-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Group insurance contracts

 

$

5.5

 

 

$

0.9

 

 

$

—

 

 

$

6.4

 

 

As of December 31, 2020:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Short-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Time deposits and certificates of deposit

 

$

0.7

 

 

$

—

 

 

$

—

 

 

$

0.7

 

Bankers' acceptance drafts

 

 

3.8

 

 

 

—

 

 

 

—

 

 

 

3.8

 

U.S. treasury obligations

 

 

223.2

 

 

 

—

 

 

 

—

 

 

 

223.2

 

 

 

$

227.7

 

 

$

—

 

 

$

—

 

 

$

227.7

 

 

As of December 31, 2020:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Long-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Group insurance contracts

 

$

5.6

 

 

$

0.9

 

 

$

—

 

 

$

6.5