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Investments in Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

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, gross unrealized losses, and fair value of Investments in marketable securities:

						December 31,
						2020						2021
Cost						$	69.4					$	73.2
Unrealized gains						5.5						8.1
Unrealized losses						(0.0		)				(2.8)
Fair value						$	74.9					$	78.5

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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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