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Investments - Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments |  |
Net unrealized gains (losses) on fixed maturities, available-for-sale | $ (9,086.6) | $ (7,445.7)
Net unrealized gains (losses) on derivative instruments | 25.2 | 50.7
Adjustments for assumed changes in amortization patterns | (5.1) | (1.7)
Adjustments for assumed changes in policyholder liabilities | 1.4 | 0.5
Net unrealized gains (losses) other investments and noncontrolling interest adjustments | 22.4 | 7.9
Provision for deferred income tax benefits (taxes) | 1,930.1 | 1,570.1
Net unrealized gains (losses) on available-for-sale securities and derivative instruments | $ (7,112.6) | $ (5,818.2)

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- Definition This item represents the cumulative net unrealized gains/losses adjustment related to deferred acquisition costs, sales inducements and unearned revenue reserves. + References No definition available. + Details
Name: | pfg_AdjustmentsAssumedChangesAmortizationPatterns
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the cumulative net unrealized gains/losses adjustment related to changes in policyholder benefits and claims and changes in the policyholder dividend obligation. + References No definition available. + Details
Name: | pfg_AdjustmentsAssumedChangesLiabilityForPolicyholderBenefitsAndClaims
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cumulative net unrealized gains/losses on fixed maturities available-for-sale, equity securities available-for-sale and derivative instruments net of adjustments related to deferred acquisition costs, sales inducements, unearned revenue reserves, changes in policyholder benefits and claims and applicable income taxes. + References No definition available. + Details
Name: | pfg_NetUnrealizedGainsLossesAvailableForSaleSecuritiesAndDerivativeInstruments
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | pfg_NetUnrealizedGainsLossesAvailableForSaleSecuritiesAndDerivativeInstrumentsAbstract
Namespace Prefix: | pfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the cumulative net unrealized gains and losses on fixed maturities available-for-sale, excluding hedged portions of those in fair value hedging. + References No definition available. + Details
Name: | pfg_NetUnrealizedGainsLossesDebtSecuritiesAvailableForSaleSecurities
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the cumulative net unrealized gains/losses on derivatives in qualifying cash flow hedges. + References No definition available. + Details
Name: | pfg_NetUnrealizedGainsLossesDerivativeInstruments
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the cumulative net unrealized gains/losses on other investments and net unrealized gains/losses attributable to noncontrolling interests. + References No definition available. + Details
Name: | pfg_NetUnrealizedGainsLossesOtherInvestmentsAndNoncontrollingInterestAdjustments
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This item represents the applicable deferred income tax impacts of cumulative net unrealized gains/losses on fixed maturities available-for-sale, equity securities available-for-sale and derivative instruments net of adjustments related deferred acquisition costs, sales inducements, unearned revenue reserves, and changes in policyholder benefits and claims. + References No definition available. + Details
Name: | pfg_ProvisionDeferredIncomeTaxBenefitsExpense
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant