XML 153 R142.htm IDEA: XBRL DOCUMENT
v3.23.1

Subsequent Event (Details) $ in Millions | Apr. 07, 2023 USD ($)
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Subsequent Event | Floating rate notes payable, due 2055 |
Subsequent Event |
Redemption amount of debt | $ 400.0

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=pfg_FloatingRateNotesPayableDue2055Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |