XML 45 R28.htm IDEA: XBRL DOCUMENT v3.21.1

Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Marketable Securities [Abstract]

Schedule of Investments in Marketable Securities

The following table summarizes the cost, gross unrealized gains, gross unrealized losses, and fair value of Investments in marketable securities:

															December 31, 2020						March 31, 2021
Cost															$	69.4					$	102.9
Unrealized gains															5.5						6.3
Unrealized losses															(0.0		)				(0.4)
Fair value															$	74.9					$	108.8

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