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Stockholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Comprehensive Income (Loss) Pre-Tax    
Net unrealized gains (losses) on available-for-sale securities during the period, pre-tax $ 283.3us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 660.5us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, pre-tax (13.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (23.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, pre-tax (13.3)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesBeforeTax (54.3)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesBeforeTax
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, pre-tax (168.8)pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax (294.5)pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsBeforeTax
Net unrealized gains (losses) on available-for-sale securities, pre-tax 87.6pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseBeforeTax 288.7pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseBeforeTax
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, pre-tax 21.5pfg_OtherComprehensiveIncomeNoncreditImpairmentLossesArisingDuringPeriodBeforeTax 30.1pfg_OtherComprehensiveIncomeNoncreditImpairmentLossesArisingDuringPeriodBeforeTax
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax (1.3)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesBeforeTax (3.2)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesBeforeTax
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 0.2pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesBeforeTax (0.2)pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesBeforeTax
Noncredit component of impairment losses on fixed maturities, available-for-sale, pre-tax 20.4pfg_OtherComprehensiveIncomeReclassificationAdjustmentBeforeTax 26.7pfg_OtherComprehensiveIncomeReclassificationAdjustmentBeforeTax
Net unrealized gains (losses) on derivative instruments during the period, pre-tax 52.3us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax 9.7us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Reclassification adjustment for (gains) losses on derivative instruments included in net income, pre-tax (10.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax 9.7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Adjustments for assumed changes in amortization patterns related to derivative instruments, pre-tax 10.1pfg_AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesBeforeTax (0.2)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesBeforeTax
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, pre-tax (9.2)pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesBeforeTax (5.3)pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesBeforeTax
Net unrealized gains (losses) on derivative instruments, pre-tax 43.1pfg_OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseBeforeTax 13.9pfg_OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseBeforeTax
Foreign currency translation adjustment, pre-tax (168.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (55.4)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, pre-tax 20.3pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax 5.5pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax
Net unrecognized postretirement benefit obligation, pre-tax 20.3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 5.5us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive income (loss), pre-tax 3.4us-gaap_OtherComprehensiveIncomeLossBeforeTax 279.4us-gaap_OtherComprehensiveIncomeLossBeforeTax
Other Comprehensive Income (Loss) Tax    
Net unrealized gains (losses) on available-for-sale securities during the period, tax (98.3)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (223.3)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income, tax 4.7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 7.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Adjustments for assumed changes in amortization patterns related to available-for-sale securities, tax 4.7pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesTax 19.0pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesTax
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities, tax 58.4pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax 100.2pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsTax
Net unrealized gains (losses) on available-for-sale securities, tax (30.5)pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseTax (96.5)pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseTax
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period, tax (7.4)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities (10.5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale, tax 0.5pfg_AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesTax 1.3pfg_AdjustmentsForAssumedChangesInAmortizationPatternsOtherThanTemporaryImpairmentLossesTax
Noncredit component of impairment losses on fixed maturities, available-for-sale, tax (6.9)pfg_OtherComprehensiveIncomeReclassificationAdjustmentTax (9.2)pfg_OtherComprehensiveIncomeReclassificationAdjustmentTax
Net unrealized gains (losses) on derivative instruments during the period, tax (18.4)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax (3.4)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Reclassification adjustment for (gains) losses on derivative instruments included in net income, tax 3.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax (3.5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
Adjustments for assumed changes in amortization patterns related to derivative instruments, tax (3.6)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesTax  
Adjustments for assumed changes in policyholder liabilities related to derivative instruments, tax 3.3pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesTax 2.0pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesTax
Net unrealized gains (losses) on derivative instruments, tax (15.3)pfg_OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseTax (4.9)pfg_OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseTax
Foreign currency translation adjustment, tax 35.4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax 9.8us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost, tax (8.3)pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostTax (2.0)pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostTax
Net unrecognized postretirement benefit obligation, tax (8.3)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (2.0)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other comprehensive income (loss), tax (25.6)us-gaap_OtherComprehensiveIncomeLossTax (102.8)us-gaap_OtherComprehensiveIncomeLossTax
Other Comprehensive Income (Loss) After-Tax    
Net unrealized gains (losses) on available-for-sale securities during the period 185.0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 437.2us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for (gains) losses on available-for-sale securities included in net income (8.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (15.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Adjustments for assumed changes in amortization patterns related to available-for-sale securities (8.6)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesNetOfTax (35.3)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsAvailableForSaleSecuritiesNetOfTax
Adjustments for assumed changes in policyholder liabilities related to available-for-sale securities (110.4)pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax (194.3)pfg_AdjustmentsForAssumedChangesInLiabilityForPolicyholderBenefitsAndClaimsNetOfTax
Net unrealized gains (losses) on available-for-sale securities 57.1pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax 192.2pfg_OtherComprehensiveIncomeAvailableForSaleSecuritiesPeriodIncreaseDecreaseNetOfTax
Noncredit component of impairment losses on fixed maturities, available-for-sale during the period 14.1us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities 19.6us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Adjustments for assumed changes in amortization patterns related to noncredit component of impairment losses on fixed maturities, available-for-sale (0.8)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsNoncreditImpairmentLossesNetOfTax (1.9)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsNoncreditImpairmentLossesNetOfTax
Adjustments for assumed changes in policyholder liabilities related to noncredit component of impairment losses on fixed maturities, available-for-sale 0.2pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesNetOfTax (0.2)pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesOtherThanTemporaryImpairmentLossesNetOfTax
Noncredit component of impairment losses on fixed maturities, available-for-sale 13.5pfg_OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax 17.5pfg_OtherComprehensiveIncomeReclassificationAdjustmentNetOfTax
Net unrealized gains (losses) on derivative instruments during the period 33.9us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 6.3us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification adjustment for (gains) losses on derivative instruments included in net income (6.7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 6.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Adjustments for assumed changes in amortization patterns related to derivative instruments 6.5pfg_AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesNetOfTax (0.2)pfg_AdjustmentsForAssumedChangesInAmortizationPatternsDerivativesNetOfTax
Adjustments for assumed changes in policyholder liabilities related to derivative instruments (5.9)pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesNetOfTax (3.3)pfg_AdjustmentsForAssumedChangesInPolicyholderLiabilitiesDerivativesNetOfTax
Net unrealized gains (losses) on derivative instruments 27.8pfg_OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax 9.0pfg_OtherComprehensiveIncomeDerivativesPeriodIncreaseDecreaseNetOfTax
Foreign currency translation adjustment (132.6)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (45.6)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Amortization of prior service (benefit) cost and actuarial (gain) loss included in net periodic benefit cost 12.0pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax 3.5pfg_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansPriorServiceCostAndNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax
Net unrecognized postretirement benefit obligation 12.0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 3.5us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income (loss) $ (22.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 176.6us-gaap_OtherComprehensiveIncomeLossNetOfTax