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Debt - Short-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Short-Term Debt
Credit facilities	$ 1,024.8	$ 933.4
Short-term debt	152.7	61.1
Credit facility maturing in October 2027 | Principal Life Insurance Company
Short-Term Debt
Credit facilities	$ 800.0	$ 800.0
Unsecured lines of credit
Short-Term Debt
Weighted-average interest rates on short-term borrowings (as a percent)	7.60%	15.60%
Unsecured lines of credit | Principal Compania de Seguros de Vida Chile S.A.
Short-Term Debt
Credit facilities	$ 77.0	$ 97.3
Short-term debt	31.1	58.4
Unsecured lines of credit | Principal International de Chile S.A.
Short-Term Debt
Credit facilities	21.8	33.6
Short-term debt	2.6	0.2
Secured subscription facility
Short-Term Debt
Credit facilities	$ 150.0
Weighted-average interest rates on short-term borrowings (as a percent)	6.84%
Secured subscription facility | Principal Credit Real Estate Income Trust
Short-Term Debt
Credit facilities	$ 126.0
Short-term debt	$ 119.0
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
Uncollateralized debt | Other short-term borrowings
Short-Term Debt
Credit facilities		2.5
Short-term debt		$ 2.5

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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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