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v3.23.3

Reinsurance - Cost of Reinsurance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Reinsurance |  |  |  |  |
Cost of reinsurance asset | $ 3,286.6 |  | $ 3,286.6 |  | $ 3,339.1
Cost of reinsurance liability | 150.2 |  | 150.2 |  | $ 191.1
Cost of reinsurance amortization | $ (25.0) | $ 7.6 | $ 8.2 | $ 2.6 |

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