Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2017
Document Documentand Entity Information [Abstract]
Entity Registrant Name	PENTAIR PLC
Entity Central Index Key	0000077360
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Trading Symbol	PNR
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 Voluntary Filers	No
Entity Common Stock, Shares Outstanding	171,363,615
Entity Public Float		$ 6,703,824,353