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Debt - Additional Information (Detail) (USD $)
12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 04, 2012
Dec. 31, 2012
Sep. 29, 2012
Oct. 30, 2012
Dec. 31, 2012
Sep. 28, 2013
Oct. 31, 2012
Nov. 30, 2012
Debt Disclosure [Line Items]                      
Debt transaction cost paid $ 0us-gaap_PaymentsOfDebtExtinguishmentCosts $ 0us-gaap_PaymentsOfDebtExtinguishmentCosts $ 74,800,000us-gaap_PaymentsOfDebtExtinguishmentCosts                
Debt instrument proceeds used to repay amounts of other debt                 435,000,000pnr_DebtInstrumentProceedsUsedToRepayAmountsOfOtherDebt    
Commercial paper outstanding 987,600,000us-gaap_CommercialPaper 528,900,000us-gaap_CommercialPaper                  
Cost and expenses incurred in connection with acquisition   8,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 57,300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts                
Compliance with debt agreement financial covenants
we were in compliance with all financial covenants in our debt agreements.
                   
Future minimum lease payments 6,900,000us-gaap_CapitalLeasesFutureMinimumPaymentsDue                    
Imputed interest 200,000us-gaap_UnrecordedUnconditionalPurchaseObligationImputedInterest                    
Debt, Long-term and Short-term, Combined Amount 3,004,100,000us-gaap_DebtLongtermAndShorttermCombinedAmount 2,550,400,000us-gaap_DebtLongtermAndShorttermCombinedAmount                  
Pentair Middle East Holding S.a.r.l.                      
Debt Disclosure [Line Items]                      
Percentage Of Ownership Interest Acquired       25.00%pnr_PercentageOfOwnershipInterestAcquired
/ us-gaap_BusinessAcquisitionAxis
= pnr_PentairMiddleEastHoldingS.a.r.l.Member
             
Cash paid         100,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= pnr_PentairMiddleEastHoldingS.a.r.l.Member
           
CPT                      
Debt Disclosure [Line Items]                      
Capital lease obligation cost 19,500,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= pnr_CleanProcessTechnologiesMember
41,700,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= pnr_CleanProcessTechnologiesMember
                 
Accumulated amortization 2,400,000pnr_AccumulatedAmortizationPropertyUnderCapitalLease
/ us-gaap_BusinessAcquisitionAxis
= pnr_CleanProcessTechnologiesMember
7,600,000pnr_AccumulatedAmortizationPropertyUnderCapitalLease
/ us-gaap_BusinessAcquisitionAxis
= pnr_CleanProcessTechnologiesMember
                 
Credit Facility                      
Debt Disclosure [Line Items]                      
Facility Fees, minimum           0.00100pnr_FacilityFeeBasisPointsMinimum
/ us-gaap_LineOfCreditFacilityAxis
= pnr_CreditFacilityMember
         
Facility Fees, maximum           0.00300pnr_FacilityFeeBasisPointsMaximum
/ us-gaap_LineOfCreditFacilityAxis
= pnr_CreditFacilityMember
         
Remaining availability under Credit Facility 1,102,600,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= pnr_CreditFacilityMember
                   
Other Credit Facilities                      
Debt Disclosure [Line Items]                      
Credit facility maximum borrowing capacity 78,300,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= pnr_OtherCreditFacilitiesMember
                   
Line of credit facility, amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= pnr_OtherCreditFacilitiesMember
                   
Minimum                      
Debt Disclosure [Line Items]                      
Debt agreement financial covenant, leverage ratio 3.50pnr_LeverageRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                   
Maximum                      
Debt Disclosure [Line Items]                      
Cost and expenses incurred in connection with acquisition 25,000,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                   
Debt agreement financial covenant, leverage ratio 3.00pnr_LeverageRatio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                   
Senior Notes                      
Debt Disclosure [Line Items]                      
Whole premium amount                   65,800,000pnr_DebtInstrumentPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Terminate related interest rate swaps             3,400,000pnr_TerminatedInterestRateSwapContracts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Unamortized deferred financing costs                   600,000pnr_UnamortizedDeferredFinanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior Notes, 5.000% Due 2021                      
Debt Disclosure [Line Items]                      
Aggregate principal amount 373,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
                   
Debt, interest rate 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
                   
Debt transaction cost paid               5,600,000us-gaap_PaymentsOfDebtExtinguishmentCosts
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
     
Aggregate principal amount 127,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
                   
Senior Notes, 5.000% Due 2021 | Senior Notes                      
Debt Disclosure [Line Items]                      
Debt, Weighted Average Interest Rate 5.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Debt, Long-term and Short-term, Combined Amount 500,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
500,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                 
Senior Notes 1.350% due 2015                      
Debt Disclosure [Line Items]                      
Aggregate principal amount                     350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointThreeFiveZeroPercentDueTwentyFifteenMember
Debt, interest rate                     1.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointThreeFiveZeroPercentDueTwentyFifteenMember
Senior Notes 1.350% due 2015 | Senior Notes                      
Debt Disclosure [Line Items]                      
Debt, Weighted Average Interest Rate 1.35%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointThreeFiveZeroPercentDueTwentyFifteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Debt, Long-term and Short-term, Combined Amount 350,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointThreeFiveZeroPercentDueTwentyFifteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
350,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointThreeFiveZeroPercentDueTwentyFifteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                 
Senior Notes 2.650% due 2019                      
Debt Disclosure [Line Items]                      
Aggregate principal amount                     250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesTwoPointSixFiveZeroPercentDueTwentyNineteenMember
Debt, interest rate                     2.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesTwoPointSixFiveZeroPercentDueTwentyNineteenMember
Senior Notes 2.650% due 2019 | Senior Notes                      
Debt Disclosure [Line Items]                      
Debt, Weighted Average Interest Rate 2.65%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesTwoPointSixFiveZeroPercentDueTwentyNineteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Debt, Long-term and Short-term, Combined Amount 250,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesTwoPointSixFiveZeroPercentDueTwentyNineteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
250,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesTwoPointSixFiveZeroPercentDueTwentyNineteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                 
Senior Notes 5.65% | Fixed Rate                      
Debt Disclosure [Line Items]                      
Debt, interest rate                   5.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointSixFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= pnr_FixedRateDebtMember
 
Outstanding aggregate principal                   400,000,000pnr_DebtInstrumentAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointSixFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= pnr_FixedRateDebtMember
 
Senior Notes 1.05% Due 2013 | Floating Rate                      
Debt Disclosure [Line Items]                      
Floating rate notes                   1.05%pnr_FloatingInterestRateBaseRate
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointZeroFiveZeroPercentDueTwentyThirteenMember
/ us-gaap_LongtermDebtTypeAxis
= pnr_FloatingRateDebtMember
 
Senior Notes 1.05% Due 2013 | Senior Notes                      
Debt Disclosure [Line Items]                      
Redemption value             100,000,000pnr_NotesCalledForRedemptionCarryingValueOfNotesConverted
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointZeroFiveZeroPercentDueTwentyThirteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Senior Notes 3.150% due 2022                      
Debt Disclosure [Line Items]                      
Aggregate principal amount                 550,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesThreePointOneFiveZeroPercentDueTwentyTwentyTwoMember
   
Debt, interest rate                 3.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesThreePointOneFiveZeroPercentDueTwentyTwentyTwoMember
   
Senior Notes 3.150% due 2022 | Senior Notes                      
Debt Disclosure [Line Items]                      
Debt, Weighted Average Interest Rate 3.15%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesThreePointOneFiveZeroPercentDueTwentyTwentyTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Debt, Long-term and Short-term, Combined Amount 550,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesThreePointOneFiveZeroPercentDueTwentyTwentyTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
550,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesThreePointOneFiveZeroPercentDueTwentyTwentyTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                 
Senior Notes 1.875 % due 2017                      
Debt Disclosure [Line Items]                      
Aggregate principal amount                 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnr_NotesOnePointEightSevenFivePercentDueTwentySeventeenMember
   
Debt, interest rate                 1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_NotesOnePointEightSevenFivePercentDueTwentySeventeenMember
   
Senior Notes 1.875 % due 2017 | Senior Notes                      
Debt Disclosure [Line Items]                      
Debt, Weighted Average Interest Rate 1.875%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= pnr_NotesOnePointEightSevenFivePercentDueTwentySeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Debt, Long-term and Short-term, Combined Amount 350,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_NotesOnePointEightSevenFivePercentDueTwentySeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
350,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= pnr_NotesOnePointEightSevenFivePercentDueTwentySeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                 
Subsidiary Issuer                      
Debt Disclosure [Line Items]                      
Ownership percentage 100.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
                   
Debt transaction cost paid     0us-gaap_PaymentsOfDebtExtinguishmentCosts
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
               
Subsidiary Issuer | Senior Notes, 5.000% Due 2021                      
Debt Disclosure [Line Items]                      
Debt, interest rate 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesFivePointZeroZeroZeroPercentDueTwentyTwentyOneMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
                   
Subsidiary Issuer | Senior Notes 1.350% due 2015                      
Debt Disclosure [Line Items]                      
Debt, interest rate 1.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesOnePointThreeFiveZeroPercentDueTwentyFifteenMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
                   
Subsidiary Issuer | Senior Notes 2.650% due 2019                      
Debt Disclosure [Line Items]                      
Debt, interest rate 2.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesTwoPointSixFiveZeroPercentDueTwentyNineteenMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
                   
Subsidiary Issuer | Senior Notes 3.150% due 2022                      
Debt Disclosure [Line Items]                      
Debt, interest rate 3.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_SeniorNotesThreePointOneFiveZeroPercentDueTwentyTwentyTwoMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
                   
Subsidiary Issuer | Senior Notes 1.875 % due 2017                      
Debt Disclosure [Line Items]                      
Debt, interest rate 1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnr_NotesOnePointEightSevenFivePercentDueTwentySeventeenMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
                   
Revolving Credit Facility [Member]                      
Debt Disclosure [Line Items]                      
Credit facility maximum borrowing capacity $ 2,100,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember