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Investments (Tables)
 6 Months Ended
Jun. 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 June 30, 2021:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Short-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Time deposits and certificates of deposit

 

$

29.1

 

 

$

—

 

 

$

—

 

 

$

29.1

 

Bankers’ acceptance drafts

 

 

3.5

 

 

 

—

 

 

 

—

 

 

 

3.5

 

Commercial paper

 

 

166.5

 

 

 

—

 

 

 

—

 

 

 

166.5

 

Corporate obligations

 

 

8.0

 

 

 

—

 

 

 

—

 

 

 

8.0

 

U.S. treasury obligations

 

 

76.8

 

 

 

—

 

 

 

(0.1

)

 

 

76.7

 

 

 

$

283.9

 

 

$

—

 

 

$

(0.1

)

 

$

283.8

 

 

 

As of June 30, 2021:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Long-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Group insurance contracts

 

$

5.7

 

 

$

0.9

 

 

$

—

 

 

$

6.6

 

 

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