Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 03, 2018
Document and Entity Information [Abstract]
Entity registrant name	PERRIGO CO PLC
Entity central index key	0001585364
Current calendar year end date	--12-31
Entity filer category	Large Accelerated Filer
Document type	10-Q
Document period end date	Jun. 30, 2018
Document calendar year focus	2018
Document calendar period focus	Q2
Amendment flag	false
Entity common stock, shares outstanding		136,832,585