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Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 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						March 31, 2023
Cost																		$	394.4					$	165.9
Unrealized gains																		59.9						24.3
Unrealized losses																		(6.4)						(3.7)
Fair value																		$	447.9					$	186.5

The following table summarizes the cost, unrealized losses, and fair value of investments in U.S. Treasury securities classified as available-for-sale, of which $100.4 million mature in 2023 and $151.7 million mature in 2024, and consolidated Affiliate sponsored investment products classified as trading:

						Available-for-sale												Trading
						December 31, 2022						March 31, 2023						December 31, 2022						March 31, 2023
Cost						$	252.3					$	252.9					$	19.7					$	20.6
Unrealized losses						(1.3)						(0.8)						(1.7)						(1.5)
Fair value						$	251.0					$	252.1					$	18.0					$	19.1

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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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