v3.26.3
Debt - Additional Information (Detail)
1 Months Ended 9 Months Ended
Mar. 31, 2029
USD ($)
Jun. 30, 2028
USD ($)
Mar. 31, 2028
USD ($)
Jun. 30, 2027
USD ($)
May 31, 2026
USD ($)
Sep. 30, 2026
USD ($)
testingPeriod
Oct. 01, 2026
USD ($)
Sep. 01, 2026
USD ($)
Jul. 27, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2022
USD ($)
Debt Instrument [Line Items]                      
Debt, gross           $ 1,500,700,000          
Leverage ratio covenant period           12 months          
Line of Credit | Term Loans Due 2024                      
Debt Instrument [Line Items]                      
Optional line of credit limit increase           $ 450,000,000.0          
Line of Credit | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility maximum borrowing capacity           900,000,000.0          
Available capacity           698,300,000          
Debt, gross           $ 200,700,000       $ 277,700,000  
Line of Credit | Revolving Credit Facility | Pentair, Pentair Finance S.à r.l (“PFSA“)                      
Debt Instrument [Line Items]                      
Number of testing periods | testingPeriod           4          
Line of Credit | Revolving Credit Facility | Minimum                      
Debt Instrument [Line Items]                      
Debt covenant, unrestricted cash           $ 5,000,000.0          
Debt agreement financial covenant, leverage ratio           1.00          
EBITDA ratio for debt           1.00          
Line of Credit | Revolving Credit Facility | Minimum | Pentair, Pentair Finance S.à r.l (“PFSA“)                      
Debt Instrument [Line Items]                      
Debt agreement financial covenant, leverage ratio           4.25          
Line of Credit | Revolving Credit Facility | Maximum                      
Debt Instrument [Line Items]                      
Debt covenant, unrestricted cash           $ 250,000,000.0          
Debt agreement financial covenant, leverage ratio           3.75          
EBITDA ratio for debt           3.00          
Line of Credit | Revolving Credit Facility | Maximum | Pentair, Pentair Finance S.à r.l (“PFSA“)                      
Debt Instrument [Line Items]                      
Debt agreement financial covenant, leverage ratio           1.00          
Line of Credit | Bridge Loan                      
Debt Instrument [Line Items]                      
Credit facility maximum borrowing capacity                 $ 1,400,000,000    
Term Loans                      
Debt Instrument [Line Items]                      
Repayments of principal in next twelve months           $ 6,300,000          
Term Loans | 4-year Term Loan Facility                      
Debt Instrument [Line Items]                      
Debt, principal amount           500,000,000.0          
Debt, gross           500,000,000.0       0  
Term Loans | 4-year Term Loan Facility | Forecast                      
Debt Instrument [Line Items]                      
Debt installment payment amount   $ 6,300,000   $ 3,100,000              
Term Loans | 5-year Term Loan Facility                      
Debt Instrument [Line Items]                      
Debt, gross           0       $ 575,000,000.0  
Unsecured Debt | Tranche 1 Term Loan Facility                      
Debt Instrument [Line Items]                      
Debt, principal amount               $ 400,000,000.0      
Unsecured Debt | Tranche 2 Term Loan Facility                      
Debt Instrument [Line Items]                      
Debt, principal amount               1,000,000,000.0      
Unsecured Debt | Tranche 2 Term Loan Facility | Forecast                      
Debt Instrument [Line Items]                      
Debt installment payment amount $ 12,500,000   $ 6,300,000                
Unsecured Debt | The Term Loan Facilities                      
Debt Instrument [Line Items]                      
Debt, principal amount             $ 1,400,000,000 $ 1,400,000,000      
Unsecured Debt | 5-year Term Loan Facility                      
Debt Instrument [Line Items]                      
Debt, principal amount                     $ 1,000,000,000.0
Repayments of long-term debt         $ 575,000,000.0            
Other Credit Facilities                      
Debt Instrument [Line Items]                      
Credit facility maximum borrowing capacity           21,200,000          
Borrowings outstanding           $ 0