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Investment Securities - Investment gains (losses) for Level 3 (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total net unrealized investment gains, pre-tax - Level 3 investments | $ 40.8 | $ 26.5 | $ 57.7 | $ 75.5
Other long-term investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Total net unrealized investment gains, pre-tax - Level 3 investments | $ 40.8 | $ 26.5 | $ 57.7 | $ 75.5

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- Definition Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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