Commitments and Contingencies - Additional Details (Details) $ in Millions, ₪ in Billions					12 Months Ended
	May 31, 2019 individual	Jan. 16, 2019 genericPrescriptionPharmaceutical defendant	Jun. 28, 2017 USD ($) individual case genericPrescriptionPharmaceutical $ / ₪	Jun. 28, 2017 ILS (₪) individual case genericPrescriptionPharmaceutical $ / ₪	Dec. 31, 2020 USD ($) complaint brand lawsuit case class genericPrescriptionPharmaceutical retailer claim defendant individual	Dec. 31, 2019 USD ($) case	Dec. 31, 2018 USD ($) brand case	Dec. 31, 2017 case	Jan. 09, 2021 lawsuit	Dec. 15, 2020 brand manufacturer pharmaceuticalCompany	Dec. 14, 2020 manufacturer	Dec. 11, 2020 manufacturer	Sep. 30, 2020 brand	Sep. 04, 2020 manufacturer	Aug. 27, 2020 manufacturer	Jul. 14, 2020 genericPrescriptionPharmaceutical case	Jul. 09, 2020 pharmaceuticalCompany	Jun. 30, 2020 manufacturer	Jun. 10, 2020 employee plaintiffGroup brand manufacturer	Jun. 09, 2020 manufacturer	May 31, 2020 healthPlan individual manufacturer	Apr. 21, 2020 genericPrescriptionPharmaceutical	Mar. 01, 2020 defendant	Feb. 29, 2020 complaint	Dec. 27, 2019 defendant	Dec. 23, 2019 defendant	Dec. 16, 2019 defendant	Dec. 11, 2019 defendant	Nov. 14, 2019 class	Jul. 18, 2019 healthPlan individual manufacturer	Apr. 30, 2019 manufacturer genericPrescriptionPharmaceutical	Dec. 21, 2018 manufacturer genericPrescriptionPharmaceutical	Aug. 03, 2018 manufacturer genericPrescriptionPharmaceutical	Jul. 31, 2018 individual defendant	Jan. 22, 2018 supermarket genericPrescriptionPharmaceutical manufacturer	Jun. 30, 2017 case	Jun. 21, 2017 class genericPrescriptionPharmaceutical individual
Loss Contingencies [Line Items]
Lease cost | $					$ 48.2	$ 48.8
Rent expense under all leases | $							$ 51.2
Purchase obligation | $					$ 1,200.0
Number of classes | class					3																								3								3
Number of complaints | complaint					2
Number of generic prescription pharmaceuticals																																					6
Number of individuals | individual																																					11
Number of current or former directors and officers | individual																																					11
Future lease maturities | $					$ 221.3	$ 158.2
States' May 2019 Case Alleging Conspiracy (which does not name Perrigo a Defendant)
Loss Contingencies [Line Items]
Number of products included in expedited cases																120
Overarching Conspiracy Class Actions
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																															27
Number of generic prescription pharmaceuticals																															135
Number of formulations of products manufactured by the Company																															2
Number of products manufactured by the Company																															1
Number of cases included in expedited schedule | case																0
Price-Fixing Lawsuit, Supermarket Chains
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer											45																								35
Number of generic prescription pharmaceuticals																																			31
Number of supermarket chains | supermarket																																			3
Price-Fixing Lawsuit, Supermaket Chains, Amended Complaint
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																																39
Number of generic prescription pharmaceuticals																																33
Price-fixing Lawsuit, Managed Care Organization
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																																	27
Number of generic prescription pharmaceuticals																																	17
Price-fixing Lawsuit, Health Insurance Carrier
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																				25
Number of generic prescription pharmaceuticals		30
Number of defendants | defendant		30
Price-fixing Lawsuit, Health Plans
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																														53
Number of health plans | healthPlan																					7									87
Number of individuals | individual																					17									17
Number of dozens of manufacturers | manufacturer																					3
Price-fixing Lawsuit, Healthcare Service Company
Loss Contingencies [Line Items]
Number of co-defendants | defendant																												38
Price-fixing Lawsuit, Medicare Advantage Claims Recovery Company
Loss Contingencies [Line Items]
Number of co-defendants | defendant																											39
Price-fixing Lawsuit, Several Counties in New York
Loss Contingencies [Line Items]
Number of co-defendants | defendant																										28
Number of other pharmaceutical companies | pharmaceuticalCompany										45
Price-fixing Lawsuit, Healthcare Management Organization
Loss Contingencies [Line Items]
Number of co-defendants | defendant																									25
Price-fixing Lawsuit, Harris County of Texas
Loss Contingencies [Line Items]
Number of co-defendants | defendant																							29
Price-fixing Lawsuit, Drugstore Chain
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer										45		45
Number of other pharmaceutical companies | pharmaceuticalCompany																	39
Number of drugs | brand										63
Price-fixing Lawsuit, Suffolk County of New York
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer															35
Price-fixing Lawsuit, Drug Wholesaler and Distributor
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer														39
State Attorney General Complaint
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																			35
Number of additional states and territories | plaintiffGroup																			50
Number of former employees | brand																			1
Number of current employees | employee																			1
Canadian Class Action Complaint
Loss Contingencies [Line Items]
Number of manufacturers | manufacturer																		29
Highfields Capital I LP, et al. v. Perrigo Company plc, et al.
Loss Contingencies [Line Items]
Number of cases alleging only state law claims | lawsuit					1
Carmignac, First Manhattan and Similar Cases
Loss Contingencies [Line Items]
Number of cases with similar factual allegations | case					7
First Manhattan and Similar Cases
Loss Contingencies [Line Items]
Number of generic prescription pharmaceuticals | case					6
Mason Capital, Pentwater and Similar Cases
Loss Contingencies [Line Items]
Number of generic prescription pharmaceuticals					6
Number of current or former directors and officers | case					11
Number of cases with similar factual allegations | case					8
Harel Insurance and TIAA-CREF Cases
Loss Contingencies [Line Items]
Number of generic prescription pharmaceuticals					6
Number of individuals | individual																																		11
Number of current or former directors and officers | individual					13
Number of cases with similar factual allegations | case					2
Number of defendants added | defendant					2
Number of defendants dismissed without prejudice | defendant																																		8
Other Cases Related to Events in 2015-2017
Loss Contingencies [Line Items]
Number of cases with similar factual allegations | case																																				1
Number of overlapped cases | case																																				3
Blackrock Global Complaint
Loss Contingencies [Line Items]
Number of generic prescription pharmaceuticals																						6
In Israel (Cases Related to Events in 2015-2017)
Loss Contingencies [Line Items]
Number of cases dismissed | case							1	1
Number of cases stayed | brand							1
Number of cases | case								3
Israel Elec. Corp. Employees' Educ. Fund v. Perrigo Company plc, et al.
Loss Contingencies [Line Items]
Number of generic prescription pharmaceuticals			6	6
Number of current or former directors and officers | individual			11	11
Number of cases dismissed | case			2	2
Preliminary class damages			$ 760.0	₪ 2.7
Foreign currency exchange rate, remeasurement | $ / ₪			0.28	0.28
In the United States (Cases Related to Irish Tax Events)
Loss Contingencies [Line Items]
Number of defendants | individual	3
Number of defendants added | individual	1
In Israel (Case Related to Irish Tax Events)
Loss Contingencies [Line Items]
Number of cases stayed | case						2
Talcum Powder Litigation
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit					45
Number of tenders accepted | brand					1
Ranitidine Litigation
Loss Contingencies [Line Items]
Number of master complaints | complaint																								3
Number of master complaints naming the Company | complaint																								2
Acetaminophen Litigation
Loss Contingencies [Line Items]
Number of lawsuits | brand													1
Number of claims for indemnification or defense | claim					16
Number of retailers | retailer					10
Subsequent Event | Ranitidine Litigation
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit									96