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Reinsurance - Cost of Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reinsurance |  |  |
Cost of reinsurance asset | $ 3,275.5 | $ 3,339.1 |
Cost of reinsurance liability | 424.6 | 479.8 |
Cost of reinsurance amortization | $ 17.7 | $ 19.3 | $ 23.0

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