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Nature of Operations and Significant Accounting Policies - Liability for Future Policy Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | $ 36,514.6 | $ 34,064.4 |  | $ 43,489.8
Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 28,769.9 | 26,230.8 |  | 33,009.5
Benefits and Protection |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 2,984.3 | 2,607.8 |  | 3,661.2
Pension risk transfer | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 23,855.8 | 21,211.4 |  | 25,863.7
Individual fixed income annuities | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 4,914.1 | 5,019.4 |  | 7,145.8
Individual fixed income annuities | Principal Asset Management | Principal International | Latin America |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 4,593.7 | 5,042.3 |  | 6,561.5
Individual disability | Benefits and Protection | Specialty Benefits |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 1,898.4 | 1,698.8 | $ 2,498.4 | 2,500.9
Term life | Benefits and Protection | Life Insurance |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | 1,085.9 | 909.0 | 1,117.6 | 1,160.3
Long-term care insurance | Corporate |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits | $ 166.7 | $ 183.5 | $ 234.7 | 257.6
Previously reported |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 36,310.8
Previously reported | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 28,130.0
Previously reported | Benefits and Protection |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 3,008.3
Previously reported | Pension risk transfer | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 21,982.8
Previously reported | Individual fixed income annuities | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 6,147.2
Previously reported | Individual fixed income annuities | Principal Asset Management | Principal International | Latin America |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 5,038.4
Previously reported | Individual disability | Benefits and Protection | Specialty Benefits |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 2,173.8
Previously reported | Term life | Benefits and Protection | Life Insurance |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 834.5
Previously reported | Long-term care insurance | Corporate |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 134.1
Adjustment for reversal of unrealized gain (loss) from AOCI |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (1,965.3)
Adjustment for reversal of unrealized gain (loss) from AOCI | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (1,162.0)
Adjustment for reversal of unrealized gain (loss) from AOCI | Benefits and Protection |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (168.7)
Adjustment for reversal of unrealized gain (loss) from AOCI | Pension risk transfer | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (947.0)
Adjustment for reversal of unrealized gain (loss) from AOCI | Individual fixed income annuities | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (215.0)
Adjustment for reversal of unrealized gain (loss) from AOCI | Individual fixed income annuities | Principal Asset Management | Principal International | Latin America |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (634.6)
Adjustment for reversal of unrealized gain (loss) from AOCI | Individual disability | Benefits and Protection | Specialty Benefits |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | (168.7)
Adjustment under the modified retrospective approach |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 101.2
Adjustment under the modified retrospective approach | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 0.1
Adjustment under the modified retrospective approach | Benefits and Protection |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 9.4
Adjustment under the modified retrospective approach | Individual fixed income annuities | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 0.1
Adjustment under the modified retrospective approach | Individual fixed income annuities | Principal Asset Management | Principal International | Latin America |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 61.7
Adjustment under the modified retrospective approach | Individual disability | Benefits and Protection | Specialty Benefits |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 2.4
Adjustment under the modified retrospective approach | Term life | Benefits and Protection | Life Insurance |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 7.0
Adjustment under the modified retrospective approach | Long-term care insurance | Corporate |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 30.0
Effect of remeasurement at the current discount rate |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 9,043.1
Effect of remeasurement at the current discount rate | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 6,041.4
Effect of remeasurement at the current discount rate | Benefits and Protection |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 812.2
Effect of remeasurement at the current discount rate | Pension risk transfer | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 4,827.9
Effect of remeasurement at the current discount rate | Individual fixed income annuities | Retirement and Income Solutions |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 1,213.5
Effect of remeasurement at the current discount rate | Individual fixed income annuities | Principal Asset Management | Principal International | Latin America |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 2,096.0
Effect of remeasurement at the current discount rate | Individual disability | Benefits and Protection | Specialty Benefits |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 493.4
Effect of remeasurement at the current discount rate | Term life | Benefits and Protection | Life Insurance |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | 318.8
Effect of remeasurement at the current discount rate | Long-term care insurance | Corporate |  |  |  |
Recent Accounting Pronouncements |  |  |  |
Liability for future policy benefits |  |  |  | $ 93.5

X
- Definition Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(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 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
Name: | us-gaap_LiabilityForFuturePolicyBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. 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