| Cover Page | Mar. 25, 2020 |
| Cover page. | |
| Title of 12(b) Security | Ordinary Shares, nominal value $0.01 per share |
| Document Type | 8-K |
| Entity Registrant Name | Pentair plc |
| Document Period End Date | Mar. 25, 2020 |
| Entity File Number | 001-11625 |
| Entity Central Index Key | 0000077360 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | L2 |
| Entity Tax Identification Number | 98-1141328 |
| Entity Address, Address Line One | Regal House |
| Entity Address, Address Line Two | 70 London Road |
| Entity Address, City or Town | Twickenham, London |
| Entity Address, Postal Zip Code | TW13QS |
| Entity Address, Country | GB |
| Country Region | 44 |
| City Area Code | 74 |
| Local Phone Number | 9421-6154 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Trading Symbol | PNR |
| Security Exchange Name | NYSE |
