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Equity Securities (Tables)

9 Months Ended

Sep. 30, 2025

Investments, Debt and Equity Securities [Abstract]

Summary of Investments in Equity Securities, by Accounting Classification

Investments in equity securities, by accounting classification, are summarized as follows:

(in millions)		September 30, 2025				December 31, 2024
Marketable equity securities		$	407.2			$	386.8
Non-marketable equity securities			231.4				202.4
Equity method investments			103.8				102.1
		$	742.4			$	691.3

Summary of Investments in Marketable Equity Securities

Investments in marketable equity securities are summarized as follows:

(in millions)		Cost				Unrealized gains (losses)				Estimated fair value
September 30, 2025
Common stocks		$	379.3			$	17.5			$	396.8
Preferred stocks			9.7				0.7				10.4
		$	389.0			$	18.2			$	407.2
December 31, 2024
Common stocks		$	397.3			$	(22.6	)		$	374.7
Preferred stocks			12.0				0.1				12.1
		$	409.3			$	(22.5	)		$	386.8

Summary of Changes in Carrying Amounts of Non-Marketable Equity Securities

A summary of the changes in the carrying amounts of non-marketable equity securities, which primarily relate to the Company's venture investment portfolio, for the three and nine months ended September 30, 2025 and 2024, is as follows:

		Three Months Ended September 30,								Nine Months Ended September 30,
(in millions)		2025				2024				2025				2024
Carrying amount, beginning of period		$	218.3			$	225.8			$	202.4			$	224.1
Net additions			16.0				2.4				31.2				5.5
Gross unrealized gains			1.0				0.1				2.5				1.5
Gross unrealized losses and impairments			(3.9	)			(9.2	)			(4.7	)			(12.0	)
Carrying amount, end of period		$	231.4			$	219.1			$	231.4			$	219.1

Summary of Cumulative Gross Unrealized Gains and Cumulative Gross Unrealized Losses and Impairments

Cumulative gross unrealized gains and cumulative gross unrealized losses and impairments related to non-marketable equity securities at September 30, 2025 and December 31, 2024, are summarized as follows:

(in millions)		September 30, 2025				December 31, 2024
Cumulative gross unrealized gains		$	247.3			$	244.8
Cumulative gross unrealized losses and impairments		$	356.3			$	351.6

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Tabular disclosure of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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