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Segment Information - Expenses from exited business (Details) - Reconciling items - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Expenses from exited business included: |  |  |  |
Amortization of reinsurance loss | $ 18.8 | $ 47.0 | $ 66.7 | $ 476.7
Other impacts of exited business | 28.6 | 21.1 | 156.0 | (115.2)
Total expenses from exited business | $ 47.4 | $ 68.1 | $ 222.7 | $ 361.5

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: |