Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - text links (Details) € in Millions, $ in Millions		3 Months Ended			9 Months Ended
		Oct. 01, 2016 USD ($)	Sep. 26, 2015 USD ($)	Jun. 27, 2015 USD ($)	Oct. 01, 2016 USD ($)	Sep. 26, 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		$ 0.0	$ 0.0		$ 0.6	$ (0.2)
Derivative, Gain (Loss) on Derivative, Net					7.0
Derivative, Loss on Derivative					0.0	300.0
Term loans	[1]		300.0			300.0
Proceeds from Issuance of Debt					1,200.0
Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1.4)	(0.4)		(0.3)	(21.9)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0.3			0.3		$ 2.3
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		3.4	(0.5)		(4.3)	(13.6)
Non-designated derivatives:
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0.5			0.5		1.9
Derivative, Gain (Loss) on Derivative, Net		(1.2)	(8.8)		(10.2)	(262.8)
Interest rate swap agreements | Designated derivatives:
Derivative [Line Items]
Derivative, Notional Amount				$ 240.0			200.0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		0.0	0.0		$ (9.0)	(12.0)
Foreign currency forward contracts
Derivative [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives					15 months
Foreign currency forward contracts | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		3.4	(0.5)		$ 4.7	(1.6)
Foreign exchange contract [Member]
Derivative [Line Items]
Derivative, Notional Amount		482.5			482.5		755.5
Foreign exchange option [Member] | Designated derivatives:
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net						(1.9)
Omega [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net				$ 0.0
Omega [Member] | Interest rate swap agreements | Designated derivatives:
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 agreements | Designated derivatives:
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] | Non-designated derivatives:
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net						259.8
Omega [Member] | Interest rate swap agreements | Designated derivatives:
Derivative [Line Items]
Derivative, Notional Amount								20.0
Other liabilities [Member] | Foreign currency forward contracts | Designated derivatives:
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0.3			0.3		2.0
Other liabilities [Member] | Foreign currency forward contracts | Non-designated derivatives:
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0.5			0.5		1.9
Other noncurrent liabilities [Member] | Interest rate swap agreements | Designated derivatives:
Derivative [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		0.0			0.0		$ 0.3
Other expense, net
Derivative [Line Items]
Derivative, Loss on Derivative						3.6
Interest expense, net | Treasury locks | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0.0	0.0		(0.1)	(0.1)
Interest expense, net | Interest rate swap agreements | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(0.6)	(0.4)		(1.7)	(18.6)
Interest expense, net | Foreign currency forward contracts | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(0.4)	0.0		(1.3)	0.0
Interest expense, net | Foreign currency forward contracts | Non-designated derivatives:
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(1.0)	0.1		(1.5)	(3.4)
Sales revenue, goods, net [Member] | Foreign currency forward contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		0.0	0.0		0.1	(0.3)
Sales revenue, goods, net [Member] | Foreign currency forward contracts | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0.1	(0.1)		1.0	1.8
Cost of sales [Member] | Foreign currency forward contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		0.0	0.0		0.0	0.1
Cost of sales [Member] | Foreign currency forward contracts | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0.9	0.2		1.8	(4.4)
Other nonoperating income (expense) [Member] | Interest rate swap agreements
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		0.0	0.0		(0.1)	0.0
Other nonoperating income (expense) [Member] | Foreign currency forward contracts
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		0.0	0.0		0.6	0.0
Other nonoperating income (expense) [Member] | Foreign currency forward contracts | Designated derivatives:
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1.4)	(0.1)		0.0	(0.6)
Other nonoperating income (expense) [Member] | Foreign currency forward contracts | Non-designated derivatives:
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ (0.2)	$ (8.9)		$ (8.7)	$ (259.4)
6.19% senior notes | Omega [Member] | Omega [Member]
Derivative [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt								$ 20.0

[1] Debt denominated in euros subject to fluctuations in the euro-to-U.S. dollar exchange rate.