Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - text links (Details) € in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2016 USD ($)	Mar. 28, 2015 USD ($)	Dec. 31, 2015 USD ($)	Mar. 30, 2015 USD ($)	Mar. 30, 2015 EUR (€)
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ (0.1)	$ (0.1)
Derivative, Gain (Loss) on Derivative, Net	7.0
Proceeds from Issuance of Debt	1,200.0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1.7		$ 2.3
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(7.4)	(1.8)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1.7		1.9
Derivative, Gain (Loss) on Derivative, Net	(6.8)	(258.2)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount			200.0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (9.0)	2.0
Foreign Exchange Forward [Member]
Derivative [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives	15 months
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 1.6	(3.8)
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	611.4		755.5
Omega [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 147.0
Credit facility indebtedness | Omega [Member]
Derivative [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				544.5
Euro Member Countries, Euro | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount | €					€ 135.0
Euro Member Countries, Euro | Credit facility indebtedness | Omega [Member]
Derivative [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | €					€ 500.0
Perrigo Co PLC [Member] | Foreign Exchange Option [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		259.8
Omega [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 20.0
Other Liabilities [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1.7		2.0
Other Liabilities [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1.7		1.9
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0.0		$ 0.3
Other Nonoperating Income (Expense) [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(0.1)	0.0
Other Nonoperating Income (Expense) [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(6.9)	(255.7)
Sales Revenue, Goods, Net [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(0.1)	0.0
Cost of Sales [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0.1	$ (0.1)