Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Feb. 23, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
ICFR Auditor Attestation Flag	true
Trading Symbol	HZNP
Entity Registrant Name	HORIZON THERAPEUTICS PUBLIC LIMITED COMPANY
Entity Central Index Key	0001492426
Entity Tax Identification Number	98-1195602
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity File Number	001-35238
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Incorporation, State or Country Code	L2
Entity Address, Address Line One	70 St. Stephen’s Green
Entity Address, City or Town	Dublin 2
Entity Address, Postal Zip Code	D02 E2X4
Entity Address, Country	IE
City Area Code	011
Local Phone Number	353 1 772 2100
Title of 12(b) Security	Ordinary shares, nominal value $0.0001 per share
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		228,448,024
Entity Public Float			$ 18.3
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Chicago, Illinois