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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities      
Net income (loss) $ 1,176.4us-gaap_ProfitLoss $ 936.1us-gaap_ProfitLoss $ 825.4us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Amortization of deferred acquisition costs 367.2us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense 187.1us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense 94.9us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Additions to deferred acquisition costs (404.1)us-gaap_DeferredPolicyAcquisitionCostsAdditions (447.0)us-gaap_DeferredPolicyAcquisitionCostsAdditions (428.9)us-gaap_DeferredPolicyAcquisitionCostsAdditions
Accrued investment income 26.2us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable 52.3us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable 30.8us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable
Net cash flows for trading securities (93.4)us-gaap_ProceedsFromPaymentsForTradingSecurities (76.0)us-gaap_ProceedsFromPaymentsForTradingSecurities 335.8us-gaap_ProceedsFromPaymentsForTradingSecurities
Premiums due and other receivables 26.9us-gaap_IncreaseDecreaseInReceivables (131.9)us-gaap_IncreaseDecreaseInReceivables 70.6us-gaap_IncreaseDecreaseInReceivables
Contractholder and policyholder liabilities and dividends 1,634.0us-gaap_IncreaseDecreaseInInsuranceLiabilities 1,614.7us-gaap_IncreaseDecreaseInInsuranceLiabilities 2,054.7us-gaap_IncreaseDecreaseInInsuranceLiabilities
Current and deferred income taxes (benefits) 175.9us-gaap_IncreaseDecreaseInIncomeTaxes 211.7us-gaap_IncreaseDecreaseInIncomeTaxes 18.4us-gaap_IncreaseDecreaseInIncomeTaxes
Net realized capital (gains) losses (14.7)us-gaap_GainLossOnInvestments 225.2us-gaap_GainLossOnInvestments (114.1)us-gaap_GainLossOnInvestments
Depreciation and amortization expense 169.5us-gaap_DepreciationAmortizationAndAccretionNet 153.9us-gaap_DepreciationAmortizationAndAccretionNet 132.1us-gaap_DepreciationAmortizationAndAccretionNet
Mortgage loans held for sale, acquired or originated     (48.0)us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale
Mortgage loans held for sale, sold or repaid, net of gain 43.3us-gaap_ProceedsFromSaleAndCollectionOfLoansHeldforsale 0.2us-gaap_ProceedsFromSaleAndCollectionOfLoansHeldforsale 90.0us-gaap_ProceedsFromSaleAndCollectionOfLoansHeldforsale
Real estate acquired through operating activities (49.4)us-gaap_PaymentsToAcquireHeldForSaleRealEstate (107.2)us-gaap_PaymentsToAcquireHeldForSaleRealEstate (46.4)us-gaap_PaymentsToAcquireHeldForSaleRealEstate
Real estate sold through operating activities 158.9us-gaap_ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans 24.2us-gaap_ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans 43.9us-gaap_ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans
Stock-based compensation 75.3us-gaap_ShareBasedCompensation 68.5us-gaap_ShareBasedCompensation 63.8us-gaap_ShareBasedCompensation
Other (189.1)us-gaap_OtherNoncashIncomeExpense (490.6)us-gaap_OtherNoncashIncomeExpense (42.2)us-gaap_OtherNoncashIncomeExpense
Net adjustments 1,926.5us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 1,285.1us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 2,255.4us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by (used in) operating activities 3,102.9us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 2,221.2us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 3,080.8us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities      
Available-for-sale securities: Purchases (9,054.0)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (9,025.2)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (8,263.9)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Available-for-sale securities: Sales 2,512.0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 1,919.1us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 1,303.7us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Available-for-sale securities: Maturities 6,244.7us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 7,359.2us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 6,647.5us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Mortgage loans acquired or originated (2,169.6)us-gaap_PaymentsToAcquireMortgageNotesReceivable (2,192.9)us-gaap_PaymentsToAcquireMortgageNotesReceivable (2,538.4)us-gaap_PaymentsToAcquireMortgageNotesReceivable
Mortgage loans sold or repaid 1,793.6us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable 2,095.1us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable 1,668.0us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable
Real estate acquired (281.7)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment (85.6)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment (151.8)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment
Net (purchases) sales of property and equipment (136.0)pfg_PaymentsToAcquirePropertyPlantAndEquipmentNet (59.4)pfg_PaymentsToAcquirePropertyPlantAndEquipmentNet (38.9)pfg_PaymentsToAcquirePropertyPlantAndEquipmentNet
Purchases of interest in subsidiaries, net of cash acquired   (1,268.3)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates (80.4)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Net change in other investments (81.7)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 31.7us-gaap_PaymentsForProceedsFromOtherInvestingActivities (157.1)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided by (used in) investing activities (1,172.7)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,226.3)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,611.3)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities      
Issuance of common stock 77.5us-gaap_ProceedsFromIssuanceOfCommonStock 125.8us-gaap_ProceedsFromIssuanceOfCommonStock 28.9us-gaap_ProceedsFromIssuanceOfCommonStock
Acquisition of treasury stock (222.7)us-gaap_PaymentsForRepurchaseOfCommonStock (153.6)us-gaap_PaymentsForRepurchaseOfCommonStock (272.7)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from financing element derivatives 15.1us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities 47.0us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities 51.8us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities
Payments for financing element derivatives (58.0)us-gaap_PaymentsForDerivativeInstrumentFinancingActivities (48.0)us-gaap_PaymentsForDerivativeInstrumentFinancingActivities (49.9)us-gaap_PaymentsForDerivativeInstrumentFinancingActivities
Excess tax benefits from share-based payment arrangements 9.7us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 10.1us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 10.8us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Purchase of subsidiary shares from noncontrolling interest (227.0)us-gaap_PaymentsToMinorityShareholders (52.9)us-gaap_PaymentsToMinorityShareholders  
Sale of subsidiary shares to noncontrolling interest   31.8us-gaap_ProceedsFromMinorityShareholders  
Dividends to common stockholders (376.6)us-gaap_PaymentsOfDividendsCommonStock (288.4)us-gaap_PaymentsOfDividendsCommonStock (231.3)us-gaap_PaymentsOfDividendsCommonStock
Dividends to preferred stockholders (33.0)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (33.0)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (33.0)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Issuance of long-term debt 38.5us-gaap_ProceedsFromIssuanceOfLongTermDebt 38.2us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,493.4us-gaap_ProceedsFromIssuanceOfLongTermDebt
Principal repayments of long-term debt (100.3)us-gaap_RepaymentsOfLongTermDebt (218.2)us-gaap_RepaymentsOfLongTermDebt (450.6)us-gaap_RepaymentsOfLongTermDebt
Net proceeds from (repayments of) short-term borrowings (118.3)us-gaap_ProceedsFromRepaymentsOfShortTermDebt 108.0us-gaap_ProceedsFromRepaymentsOfShortTermDebt (68.8)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Investment contract deposits 5,638.4us-gaap_AdditionsToContractHoldersFunds 6,716.3us-gaap_AdditionsToContractHoldersFunds 6,900.4us-gaap_AdditionsToContractHoldersFunds
Investment contract withdrawals (7,099.2)us-gaap_WithdrawalFromContractHoldersFunds (8,852.7)us-gaap_WithdrawalFromContractHoldersFunds (7,522.6)us-gaap_WithdrawalFromContractHoldersFunds
Net increase (decrease) in banking operation deposits 30.7us-gaap_IncreaseDecreaseInDeposits (225.7)us-gaap_IncreaseDecreaseInDeposits 32.0us-gaap_IncreaseDecreaseInDeposits
Other (12.9)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (5.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (14.6)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities (2,438.1)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,800.3)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (126.2)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents (507.9)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,805.4)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,343.3us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 2,371.8us-gaap_CashAndCashEquivalentsAtCarryingValue 4,177.2us-gaap_CashAndCashEquivalentsAtCarryingValue 2,833.9us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 1,863.9us-gaap_CashAndCashEquivalentsAtCarryingValue 2,371.8us-gaap_CashAndCashEquivalentsAtCarryingValue 4,177.2us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Information:      
Cash paid for interest 137.6us-gaap_InterestPaid 144.1us-gaap_InterestPaid 127.7us-gaap_InterestPaid
Cash paid for income taxes $ 73.8us-gaap_IncomeTaxesPaidNet $ 61.2us-gaap_IncomeTaxesPaidNet $ 82.7us-gaap_IncomeTaxesPaidNet