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Investments in Marketable Securities (Tables)

9 Months Ended

Sep. 30, 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						September 30, 2021
Cost															$	69.4					$	68.5
Unrealized gains															5.5						8.2
Unrealized losses															(0.0		)				(0.9)
Fair value															$	74.9					$	75.8

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- Definition

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

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