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CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net investment income | $ 79.6 | $ 77.9 | $ 238.9 | $ 207.3 | $ 275.7 | $ 188.1 | $ 147.5
Realized and unrealized investment gains (losses) | 22.0 | 11.3 | 48.8 | 47.4 | 75.9 | 5.0 | 56.2
General, administrative and corporate expenses | 125.6 | 120.1 | 400.1 | 352.8 | 503.6 | 494.2 | 418.0
Asset Management Arrangement |  |  |  |  |  |  |
Net investment income |  |  |  |  | 9.4 | 4.9 | 5.8
Related Party |  |  |  |  |  |  |
Realized and unrealized investment gains (losses) | 0.6 | 1.4 | 3.7 | 6.1 | 8.7 | (0.4) | 0.0
General, administrative and corporate expenses | 1.3 | 1.2 | 3.8 | 3.7 | 5.0 | 5.0 | 5.0
Related Party | Management Consulting Agreement |  |  |  |  |  |  |
Net investment income | 0.3 | 4.8 | 10.7 | 13.3 | 19.6 | 3.1 | 0.0
Related Party | Asset Management Arrangement |  |  |  |  |  |  |
Net investment income | $ 0.0 | $ 2.1 | $ 2.8 | $ 7.3 | $ 9.4 | $ 4.9 | $ 5.8

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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 5 -SubTopic 220 -Topic 946 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483581/946-220-45-5 + Details
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