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Debt - Short-Term Debt (Details) - USD ($) $ in Millions | 24 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Short-Term Debt |  |
Credit facilities | $ 933.4 | $ 936.9
Short-term debt | 61.1 | 80.7
Credit facility maturing in October 2027 | Principal Life Insurance Company |  |
Short-Term Debt |  |
Credit facilities | 800.0 | 800.0
Unsecured lines of credit | Principal International Chile |  |
Short-Term Debt |  |
Credit facilities | 130.9 | 136.9
Short-term debt | $ 58.6 | 80.7
Unsecured lines of credit | Maximum | Principal International Chile |  |
Short-Term Debt |  |
Term of credit facility | 1 year |
Commercial paper |  |
Short-Term Debt |  |
Support provided by back-stop facility for commercial paper program (as a percent) | 100.00% |
Back-stop facility outstanding balances | $ 0.0 | $ 0.0
Weighted-average interest rates on short-term borrowings (as a percent) | 15.60% | 6.00%
Uncollateralized debt | Other short-term borrowings |  |
Short-Term Debt |  |
Credit facilities | $ 2.5 |
Short-term debt | $ 2.5 |

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