v3.26.3
Equity Securities (Tables)
9 Months Ended
Sep. 30, 2026
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,
2026

 

 

December 31,
2025

 

Marketable equity securities

 

$

505.4

 

 

$

477.6

 

Non-marketable equity securities

 

 

216.6

 

 

 

253.1

 

Equity method investments

 

 

146.1

 

 

 

118.4

 

 

$

868.1

 

 

$

849.1

 

Summary of Investments in Marketable Equity Securities

Investments in marketable equity securities are summarized as follows:

 

(in millions)

 

Cost

 

 

Unrealized gains

 

 

Estimated
fair value

 

September 30, 2026

 

 

 

 

 

 

 

 

 

Common stocks

 

$

457.5

 

 

$

38.1

 

 

$

495.6

 

Preferred stocks

 

 

8.6

 

 

 

1.2

 

 

 

9.8

 

 

$

466.1

 

 

$

39.3

 

 

$

505.4

 

December 31, 2025

 

 

 

 

 

 

 

 

 

Common stocks

 

$

457.9

 

 

$

9.8

 

 

$

467.7

 

Preferred stocks

 

 

9.0

 

 

 

0.9

 

 

 

9.9

 

 

$

466.9

 

 

$

10.7

 

 

$

477.6

 

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, 2026 and 2025, is as follows:

 

 

Three Months Ended
September 30,

 

 

Nine Months Ended
September 30,

 

(in millions)

 

2026

 

 

2025

 

 

2026

 

 

2025

 

Carrying amount, beginning of period

 

$

214.4

 

 

$

218.3

 

 

$

253.1

 

 

$

202.4

 

Net additions

 

 

2.7

 

 

 

16.0

 

 

 

7.1

 

 

 

31.2

 

Gross unrealized gains

 

 

0.3

 

 

 

1.0

 

 

 

0.7

 

 

 

2.5

 

Gross unrealized losses and impairments

 

 

(0.8

)

 

 

(3.9

)

 

 

(44.3

)

 

 

(4.7

)

Carrying amount, end of period

 

$

216.6

 

 

$

231.4

 

 

$

216.6

 

 

$

231.4

 

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, 2026 and December 31, 2025, are summarized as follows:

(in millions)

 

September 30,
2026

 

 

December 31,
2025

 

Cumulative gross unrealized gains

 

$

280.8

 

 

$

280.1

 

Cumulative gross unrealized losses and impairments

 

$

405.1

 

 

$

360.8