DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Foreign Currency Forward Contracts (Details) - Foreign currency forward contracts € in Millions, $ in Millions	Sep. 27, 2025 USD ($)	Aug. 01, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	$ 513.0	€ 300	$ 502.5
United States Dollar (USD)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	165.7		97.9
British Pound (GBP)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	120.1		101.3
European Euro (EUR)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	45.1		54.9
Polish Zloty (PLZ)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	44.0		26.7
Danish Krone (DKK)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	42.3		57.8
Canadian Dollar (CAD)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	29.7		35.5
Swedish Krona (SEK)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	19.0		66.5
Chinese Yuan (CNH)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	13.0		31.9
Hungarian Forint (HUF)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	12.8		6.3
Norwegian Krone (NOK)
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	2.5		6.8
Other
Foreign Currency Fair Value Hedge Derivative [Line Items]
Notional amount of derivatives	18.8		16.9
Notional amount, maximum individual amount	$ 10.0		$ 10.0

PERRIGO Co plc 10-Q