Debt - Additional Information (Detail)			9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) testingPeriod	Sep. 30, 2023 USD ($) testingPeriod	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 24, 2022 USD ($)
Debt Instrument [Line Items]
Debt, gross		$ 2,013,100,000	$ 2,013,100,000
Leverage ratio covenant period			12 months
2024		237,500,000	$ 237,500,000
Line of Credit | Term Loans Due 2024
Debt Instrument [Line Items]
Debt, gross		200,000,000	200,000,000
Optional line of credit limit increase		300,000,000	300,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		900,000,000	900,000,000
Debt, gross		0	0	$ 320,000,000.0
Available capacity		$ 900,000,000	$ 900,000,000
Average interest rate as of September 30, 2023		6.619%	6.619%
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
Line of Credit | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Debt covenant, unrestricted cash			$ 5,000,000
Debt agreement financial covenant, leverage ratio		1.00	1.00
EBITDA ratio for debt		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
Line of Credit | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt covenant, unrestricted cash			$ 250,000,000
Debt agreement financial covenant, leverage ratio		3.75	3.75
EBITDA ratio for debt		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
Term Loans
Debt Instrument [Line Items]
2024		$ 31,300,000	$ 31,300,000
Term Loans | 5-year Term Loan Facility
Debt Instrument [Line Items]
Debt, gross				1,000,000,000	$ 993,800,000		$ 1,000,000,000	$ 600,000,000
Average interest rate as of September 30, 2023		6.809%	6.809%
Long-term Debt, Increase to obligation							$ 400,000,000
Debt Instrument, Periodic Payment		$ 6,300,000
Term Loans | 5-year Term Loan Facility | Forecast | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	$ 12,500,000
Senior Notes | Senior Notes Five Point Nine Percent Due Twenty Thirty Two
Debt Instrument [Line Items]
Debt, gross				$ 400,000,000.0	$ 400,000,000.0	$ 400,000,000
Average interest rate as of September 30, 2023		5.90%	5.90%			5.90%
Other Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 20,800,000	$ 20,800,000
Borrowings outstanding		$ 0	$ 0