| Document and Entity Information | Oct. 20, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | PERRIGO Co plc |
| Entity Tax Identification Number | 00-0000000 |
| Amendment Flag | false |
| Entity Central Index Key | 0001585364 |
| Document Type | 8-K |
| Document Period End Date | Oct. 20, 2021 |
| Entity File Number | 001-36353 |
| Entity Incorporation State Country Code | L2 |
| Entity Address, Address Line One | The Sharp Building |
| Entity Address, Address Line Two | Hogan Place |
| Entity Address, City or Town | Dublin 2 |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | D02 TY74 |
| City Area Code | 353 1 |
| Local Phone Number | 7094000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Ordinary shares |
| Trading Symbol | PRGO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
