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Investment Securities - Investment gains (losses) for Level 3 (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |
Total net unrealized investment gains, pre-tax - Level 3 investments | $ 27.2 | $ 16.7
Other long-term investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total net unrealized investment gains, pre-tax - Level 3 investments | $ 27.2 | $ 16.7

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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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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