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Debt - Short-Term Debt (Details) - USD ($) $ in Millions	24 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Short-Term Debt
Credit facilities	$ 936.9	$ 945.6
Short-term debt	$ 80.7	$ 79.8
Weighted-average interest rates on short-term borrowings (as a percent)	6.00%	3.20%
Credit facility maturing in October 2027 | Principal Life Insurance Company
Short-Term Debt
Credit facilities	$ 800.0
Credit facility maturing November 2023 | PFG, PFS, Principal Life as co-borrowers
Short-Term Debt
Credit facilities		$ 600.0
Credit facility maturing November 2023 | PFG, PFS, Principal Life and Principal Financial Services V (UK) LTD as co-borrowers
Short-Term Debt
Credit facilities		200.0
Unsecured lines of credit | Principal International Chile
Short-Term Debt
Credit facilities	136.9	145.6
Short-term debt	$ 80.7	79.8
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

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- Definition

Amount of outstanding back-stop facilities as of the balance sheet date.

+ References

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- Definition

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

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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.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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