XML 56 R34.htm IDEA: XBRL DOCUMENT v3.20.4

Investments in Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Marketable Securities [Abstract]

Schedule of Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments

The following is a summary of the cost, gross unrealized gains, unrealized losses, and fair value of Investments in marketable securities:

						December 31,
						2019						2020
Cost						$	57.9					$	69.4
Unrealized gains						2.1						5.5
Unrealized losses						(0.6)						(0.0)
Fair value						$	59.4					$	74.9

X

- References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

+ References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration