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Segment Information - Expenses from exited business (Details) - Reconciling items - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Expenses from exited business included:
Amortization of reinsurance loss	$ 26.9	$ 11.2
Other impacts of exited business	99.4	33.5
Total expenses from exited business	$ 126.3	$ 44.7

X

- Definition

Amount of amortization expense (reversal of expense) for any reinsurance gains (losses) relating to exited business during the reporting period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of expenses from exited business incurred by the entity during the reporting period.

+ References

No definition available.

+ Details

Name:	pfg_ExpensesFromExitedBusiness
Namespace Prefix:	pfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	pfg_ExpensesFromExitedBusinessAbstract
Namespace Prefix:	pfg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in expenses of exited business due to other impacts during the reporting period.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_MaterialReconcilingItemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: