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Investments in Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2023

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,
						2022						2023
Cost						$	394.4					$	35.3
Unrealized gains						59.9						2.6
Unrealized losses						(6.4)						(0.0		)
Fair value						$	447.9					$	37.9

The following table summarizes the cost, unrealized gains, unrealized losses, and fair value of investments in U.S. Treasury securities classified as available-for-sale, all of which mature in 2024, and consolidated Affiliate sponsored investment products classified as trading:

						Available-for-Sale												Trading
						December 31, 2022						December 31, 2023						December 31, 2022						December 31, 2023
Cost						$	252.3					$	405.4					$	19.7					$	17.9
Unrealized gains						—						0.0						—						—
Unrealized losses						(1.3)						(0.1)						(1.7)						(0.1)
Fair value						$	251.0					$	405.3					$	18.0					$	17.8

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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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