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Investments in Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2022

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 equity securities:

						December 31,
						2021						2022
Cost						$	59.1					$	394.4
Unrealized gains						8.1						59.9
Unrealized losses						(2.7)						(6.4)
Fair value						$	64.5					$	447.9

The following table summarizes the cost, gross unrealized losses, and fair value of investments in U.S. Treasury Notes classified as available-for-sale, of which $100.7 million mature in 2023 and $150.3 million mature in 2024, and other debt securities classified as trading:

						Available-for-Sale												Trading
						December 31, 2021						December 31, 2022						December 31, 2021						December 31, 2022
Cost						$	—					$	252.3					$	14.1					$	19.7
Unrealized losses						—						(1.3)						(0.1)						(1.7)
Fair value						$	—					$	251.0					$	14.0					$	18.0

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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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