Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Jun. 30, 2021
Cover [Abstract]
Entity Registrant Name	Pentair plc
Document Type	10-K
Entity Incorporation, State or Country Code	L2
Entity Central Index Key	0000077360
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity File Number	001-11625
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Transition Report	false
Document Annual Report	true
Title of 12(b) Security	Ordinary Shares, nominal value $0.01 per share
Trading Symbol	PNR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding	165,098,847
Entity Public Float		$ 11,084,021,014
Entity Tax Identification Number	98-1141328
Entity Address, Address Line One	Regal House, 70 London Road,
Entity Address, Address Line Two	Twickenham,
Entity Address, City or Town	London,
Entity Address, Postal Zip Code	TW13QS
Entity Address, Country	GB
Country Region	44
City Area Code	74
Local Phone Number	9421-6154
Documents Incorporated by Reference	Parts of the Registrant’s definitive proxy statement for its annual general meeting to be held on May 17, 2022, are incorporated by reference in this Form 10-K in response to Part III, ITEM 10, 11, 12, 13 and 14.
ICFR Auditor Attestation Flag	true