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Reinsurance - Cost of Reinsurance (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Reinsurance |  |  |  |  |
Cost of reinsurance asset | $ 3,232.9 |  | $ 3,232.9 |  | $ 3,275.5
Cost of reinsurance liability | 836.6 |  | 836.6 |  | $ 424.6
Cost of reinsurance amortization | $ 453.6 | $ 15.4 | $ 459.1 | $ 33.2 |

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