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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 72,355.5 | $ 59,265.6 | $ 65,998.6
Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | 101.3 | 112.0 | 110.1
Fair Value, Inputs, Level 3 | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | 77.4 | 90.1 | 89.5
Fair Value, Inputs, Level 3 | Third Party Pricing Exemption Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | 23.9 | 21.9 | 20.6
Fair Value, Inputs, Level 3 | Corporate debt securities | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 3.0 |  | 3.0
Fair value inputs, market cap price change percentage, range, minimum | 0.30% | (1.20%) |  |
Fair value inputs, market cap price change percentage, range, maximum | 7.70% | 1.20% |  |
Fair value inputs, market cap price change percentage, weighted average | 2.60% | 0.20% |  |
Fair Value, Inputs, Level 3 | Nonredeemable preferred stocks | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 51.9 | $ 71.8 | 64.0
Fair value inputs, market cap price change percentage, range, minimum | 17.20% | (7.60%) | (6.10%) |
Fair value inputs, market cap price change percentage, range, maximum | 39.70% | (1.50%) | 27.60% |
Fair value inputs, market cap price change percentage, weighted average | 21.70% | (2.90%) | 4.40% |
Fair Value, Inputs, Level 3 | Common equities | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 22.5 | $ 18.3 | $ 22.5
Fair value inputs, market cap price change percentage, range, minimum | (45.80%) | (26.50%) | (22.00%) |
Fair value inputs, market cap price change percentage, range, maximum | 95.60% | 19.30% | 125.40% |
Fair value inputs, market cap price change percentage, weighted average | 39.70% | (4.40%) | 18.00% |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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