Debt - Additional Information (Detail)			3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($) testingPeriod	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) testingPeriod	Sep. 30, 2024 USD ($) testingPeriod	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Repayments of long-term debt				$ 362,500,000	$ 6,300,000
Leverage ratio covenant period				12 months
Line of Credit | Term Loans Due 2024
Debt Instrument [Line Items]
Optional line of credit limit increase	$ 300,000,000.0		$ 300,000,000.0	$ 300,000,000.0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	900,000,000.0		900,000,000.0	900,000,000.0
Available capacity	900,000,000.0		900,000,000.0	900,000,000.0
Debt, gross	$ 0		$ 0	$ 0		$ 0
Line of Credit | Revolving Credit Facility | Pentair, Pentair Finance S.à r.l (“PFSA“)
Debt Instrument [Line Items]
Number of testing periods | testingPeriod	4		4	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		1.00	1.00
EBITDA ratio for debt	1.00		1.00	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		4.25	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		3.75	3.75
EBITDA ratio for debt	3.00		3.00	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		1.00	1.00
Term Loans
Debt Instrument [Line Items]
Repayments of principal in next twelve months	$ 19,300,000		$ 19,300,000	$ 19,300,000
Term Loans | Term Loans, 1.033% Due 2024
Debt Instrument [Line Items]
Repayments of long-term debt			200,000,000
Debt, gross	0		0	0		200,000,000.0
Term Loans | 5-year Term Loan Facility
Debt Instrument [Line Items]
Debt, gross	825,000,000.0		825,000,000.0	825,000,000.0		$ 987,500,000
Unsecured Debt | 5-year Term Loan Facility
Debt Instrument [Line Items]
Repayments of long-term debt				162,500,000
Debt, principal amount							$ 1,000,000,000
Debt installment payment amount	12,500,000	$ 6,300,000
Debt, gross	825,000,000		825,000,000	825,000,000
Other Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	21,000,000.0		21,000,000.0	21,000,000.0
Borrowings outstanding	$ 0		$ 0	$ 0