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Reinsurance - Cost of Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Reinsurance
Cost of reinsurance asset	$ 3,126.5		$ 3,126.5		$ 3,187.6
Cost of reinsurance liability	982.5		982.5		$ 958.1
Cost of reinsurance amortization	$ 39.7	$ 55.1	$ 84.3	$ 514.2

X

- Definition

The amount of expense related to the cost of reinsurance amortization.

+ References

No definition available.

+ Details

Name:	pfg_CostOfReinsuranceAmortization
Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The reinsurance asset related to the amount of expected net reinsurance costs or profits to be spread over the expected term of the contracts.

+ References

No definition available.

+ Details

Name:	pfg_CostOfReinsuranceAsset
Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The reinsurance liability related to the amount of expected net reinsurance costs or profits to be spread over the expected term of the contracts.

+ References

No definition available.

+ Details

Name:	pfg_CostOfReinsuranceLiability
Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration