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Equity Securities (Tables) | 3 Months Ended
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Mar. 31, 2023
Investments Debt And Equity Securities [Abstract] |
Summary of Investments in Equity Securities, by Classification | Investments in equity securities, by classification, are summarized as follows:
(in millions) |  | March 31, 2023 |  |  | December 31, 2022 |
Marketable equity securities |  | $ | 315.2 |  |  | $ | 279.5 |
Non-marketable equity securities |  |  | 384.7 |  |  |  | 395.8 |
Equity method investments |  |  | 74.0 |  |  |  | 78.9 |
|  | $ | 773.9 |  |  | $ | 754.2 |
Summary of Investments in Marketable Equity Securities | Investments in marketable equity securities are summarized as follows:
(in millions) |  | Cost |  |  | Unrealized losses |  |  | Estimated fair value |
March 31, 2023 |  |  |  |  |  |  |  |  |
Common stocks |  | $ | 348.8 |  |  | $ | (44.9 | ) |  | $ | 303.9 |
Preferred stocks |  |  | 15.3 |  |  |  | (4.0 | ) |  |  | 11.3 |
|  | $ | 364.1 |  |  | $ | (48.9 | ) |  | $ | 315.2 |
December 31, 2022 |  |  |  |  |  |  |  |  |
Common stocks |  | $ | 323.7 |  |  | $ | (55.6 | ) |  | $ | 268.1 |
Preferred stocks |  |  | 15.3 |  |  |  | (3.9 | ) |  |  | 11.4 |
|  | $ | 339.0 |  |  | $ | (59.5 | ) |  | $ | 279.5 |
Summary of Investments in Non-Marketable Equity Securities | Investments in non-marketable equity securities are summarized as follows:
(in millions) |  | Cost |  |  | Unrealized gains |  |  | Carrying amount |
March 31, 2023 |  | $ | 313.3 |  |  | $ | 71.4 |  |  | $ | 384.7 |
December 31, 2022 |  | $ | 307.2 |  |  | $ | 88.6 |  |  | $ | 395.8 |

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- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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