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Contingencies, Guarantees and Indemnifications (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating leases      
Operating lease rental expense $ 37.3us-gaap_OperatingLeasesRentExpenseNet $ 36.3us-gaap_OperatingLeasesRentExpenseNet $ 41.9us-gaap_OperatingLeasesRentExpenseNet
Operating lease obligations      
Year 1: Operating lease obligations 43.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Year 2: Operating lease obligations 39.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Year 3: Operating lease obligations 33.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Year 4: Operating lease obligations 21.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Year 5: Operating lease obligations 11.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Year 6 and thereafter: Operating lease obligations 51.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total operating lease obligations 200.8us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Less: Future sublease rental income on noncancelable leases 5.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals    
Total future minimum lease payments 195.0pfg_OperatingLeasesFutureMinimumPaymentsDueNet    
Capital leases      
Capital lease gross asset balance 54.8us-gaap_CapitalLeasedAssetsGross 42.6us-gaap_CapitalLeasedAssetsGross  
Capital lease accumulated depreciation 17.0us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation 16.1us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation  
Capital lease depreciation expense 13.6us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 10.5us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 7.9us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
Capital lease future minimum lease payments      
Year 1: Capital lease future minimum lease payments 6.3us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Year 2: Capital lease future minimum lease payments 5.4us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
Year 3: Capital lease future minimum lease payments 2.5us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
Year 4: Capital lease future minimum lease payments 0.7us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
Year 5: Capital lease future minimum lease payments 0.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Year 6 and thereafter: Capital lease future minimum lease payments 0.5us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Total capital lease future minimum lease payments 15.5us-gaap_CapitalLeasesFutureMinimumPaymentsDue    
Less: Amounts representing interest 0.3us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments    
Net present value of minimum lease payments $ 15.2us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments