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Investments (Details 12) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance $ 69.8us-gaap_FinancingReceivableAllowanceForCreditLosses $ 97.4us-gaap_FinancingReceivableAllowanceForCreditLosses $ 102.1us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision: Mortgage loan valuation allowance 6.8us-gaap_ProvisionForLoanLeaseAndOtherLosses 14.9us-gaap_ProvisionForLoanLeaseAndOtherLosses 53.2us-gaap_ProvisionForLoanLeaseAndOtherLosses
Charge-offs: Mortgage loan valuation allowance (23.6)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (46.3)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs (61.8)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries: Mortgage loan valuation allowance 3.6us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery 3.9us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery 3.8us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Effect of exchange rates: Mortgage loan valuation allowance (0.1)pfg_FinancingReceivableAllowanceForCreditLossesTranslationAdjustment (0.1)pfg_FinancingReceivableAllowanceForCreditLossesTranslationAdjustment 0.1pfg_FinancingReceivableAllowanceForCreditLossesTranslationAdjustment
Ending balance, Mortgage loan valuation allowance 56.5us-gaap_FinancingReceivableAllowanceForCreditLosses 69.8us-gaap_FinancingReceivableAllowanceForCreditLosses 97.4us-gaap_FinancingReceivableAllowanceForCreditLosses
Individually evaluated for impairment, Mortgage loan valuation allowance 11.4us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 12.6us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 12.8us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Collectively evaluated for impairment, Mortgage loan valuation allowance 45.1us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 57.2us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 84.6us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Individually evaluated for impairment, Mortgage loans 31.5us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment 37.4us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment 53.3us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Collectively evaluated for impairment, Mortgage loans 11,836.6us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 11,566.0us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 11,563.8us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Mortgage loans, Total amortized cost 11,868.1us-gaap_NotesReceivableGross 11,603.4us-gaap_NotesReceivableGross 11,617.1us-gaap_NotesReceivableGross
Commercial mortgage loans      
Mortgage loan valuation allowance disclosures      
Mortgage loans, Days delinquent to be analyzed for valuation allowance 60 days    
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 28.7us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
51.8us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
64.8us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Provision: Mortgage loan valuation allowance (0.9)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
4.1us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
13.5us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Charge-offs: Mortgage loan valuation allowance (0.9)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
(28.0)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
(26.7)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Recoveries: Mortgage loan valuation allowance   0.8us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
0.2us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Ending balance, Mortgage loan valuation allowance 26.9us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
28.7us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
51.8us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Individually evaluated for impairment, Mortgage loan valuation allowance 2.4us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
2.4us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
2.4us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Collectively evaluated for impairment, Mortgage loan valuation allowance 24.5us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
26.3us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
49.4us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Individually evaluated for impairment, Mortgage loans 4.4us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
4.4us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
13.6us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Collectively evaluated for impairment, Mortgage loans 10,719.4us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
10,323.3us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
10,221.5us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Mortgage loans, Total amortized cost 10,723.8us-gaap_NotesReceivableGross
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
10,327.7us-gaap_NotesReceivableGross
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
10,235.1us-gaap_NotesReceivableGross
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Residential mortgage loans      
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 41.1us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
45.6us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
37.3us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Provision: Mortgage loan valuation allowance 7.7us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
10.8us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
39.7us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Charge-offs: Mortgage loan valuation allowance (22.7)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
(18.3)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
(35.1)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Recoveries: Mortgage loan valuation allowance 3.6us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
3.1us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
3.6us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Effect of exchange rates: Mortgage loan valuation allowance (0.1)pfg_FinancingReceivableAllowanceForCreditLossesTranslationAdjustment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
(0.1)pfg_FinancingReceivableAllowanceForCreditLossesTranslationAdjustment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
0.1pfg_FinancingReceivableAllowanceForCreditLossesTranslationAdjustment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Ending balance, Mortgage loan valuation allowance 29.6us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
41.1us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
45.6us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Individually evaluated for impairment, Mortgage loan valuation allowance 9.0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
10.2us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
10.4us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Collectively evaluated for impairment, Mortgage loan valuation allowance 20.6us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
30.9us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
35.2us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Individually evaluated for impairment, Mortgage loans 27.1us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
33.0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
39.7us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Collectively evaluated for impairment, Mortgage loans 1,117.2us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
1,242.7us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
1,342.3us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
Mortgage loans, Total amortized cost $ 1,144.3us-gaap_NotesReceivableGross
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
$ 1,275.7us-gaap_NotesReceivableGross
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember
$ 1,382.0us-gaap_NotesReceivableGross
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ResidentialMortgageMember