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Investments in Marketable Securities (Tables)

9 Months Ended

Sep. 30, 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						September 30, 2023
Cost															$	394.4					$	44.2
Unrealized gains															59.9						2.6
Unrealized losses															(6.4)						(1.8)
Fair value															$	447.9					$	45.0

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, of which $228.3 million mature in 2023 and $171.9 million mature in 2024, and consolidated Affiliate sponsored investment products classified as trading:

									Available-for-Sale												Trading
															December 31, 2022						September 30, 2023						December 31, 2022						September 30, 2023
Cost															$	252.3					$	400.7					$	19.7					$	18.3
Unrealized gains															—						0.1						—						—
Unrealized losses															(1.3)						(0.6)						(1.7)						(1.2)
Fair value															$	251.0					$	400.2					$	18.0					$	17.1

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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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