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Investments - Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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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 | $ (8,675.5) | $ 5,289.9
Net unrealized gains (losses) on derivative instruments | 142.5 | 80.1
Adjustments for assumed changes in amortization patterns | 847.9 | (266.1)
Adjustments for assumed changes in policyholder liabilities | 3.7 | (689.2)
Net unrealized gains (losses) on other investments and noncontrolling interest adjustments | 43.0 | 40.5
Provision for deferred income tax benefits (taxes) | 1,627.6 | (936.0)
Net unrealized gains (losses) on available-for-sale securities and derivative instruments | $ (6,010.8) | $ 3,519.2

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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_
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Balance Type: | credit
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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
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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
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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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
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Data Type: | xbrli:monetaryItemType
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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
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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
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Data Type: | xbrli:monetaryItemType
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