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Market Risk Benefits - Asset and Liability Position and Reconciliation (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Market Risk Benefits |  |  |  |
Market risk benefit asset | $ 173.1 | $ 109.2 |  |
Market risk benefit liability | 112.5 | 207.4 |  |
Net asset (liability) | 60.6 | (98.2) |  |
Retirement and Income Solutions | Individual variable annuities |  |  |  |
Market Risk Benefits |  |  |  |
Market risk benefit asset | 173.1 | 109.2 |  |
Market risk benefit liability | 90.8 | 181.4 |  |
Net asset (liability) | 82.3 | (72.2) | $ (494.7) | $ (591.3)
Principal Asset Management | Principal International | Guaranteed pension | Asia |  |  |  |
Market Risk Benefits |  |  |  |
Market risk benefit liability | 21.7 | 26.0 |  |
Net asset (liability) | $ (21.7) | $ (26.0) | $ (35.1) | $ (53.3)

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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480112/944-40-45-3 + Details
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- Definition Amount of asset position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B + Details
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