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Investments - Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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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 | $ 6,193.1 | $ 4,834.2
Noncredit component of impairment losses on fixed maturities, available-for-sale |  | (48.4)
Net unrealized gains (losses) on derivative instruments | 131.3 | 94.1
Adjustments for assumed changes in amortization patterns | (264.2) | (261.0)
Adjustments for assumed changes in policyholder liabilities | (1,700.9) | (1,133.5)
Net unrealized gains (losses) on other investments and noncontrolling interest adjustments | 50.3 | 96.8
Provision for deferred income tax benefits (taxes) | (935.8) | (766.9)
Net unrealized gains (losses) on available-for-sale securities and derivative instruments | $ 3,473.8 | $ 2,815.3

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- Definition Accumulated other comprehensive income or loss related to other-than-temporary impairment not a credit loss for available-for-sale debt securities. + References No definition available. + Details
Name: | pfg_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossAvailableForSaleDebtSecurities
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 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
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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