Indebtedness (Details) € in Millions, $ in Millions														1 Months Ended	3 Months Ended			6 Months Ended			12 Months Ended
		Apr. 08, 2015 USD ($)	Apr. 08, 2015 EUR (€)	Mar. 30, 2015 USD ($)	Mar. 30, 2015 EUR (€)	Dec. 05, 2014 USD ($)	Dec. 02, 2014 USD ($)	Nov. 06, 2014 EUR (€)	Jul. 28, 2014	Dec. 27, 2013 USD ($)	Dec. 23, 2013 USD ($)	Dec. 18, 2013 USD ($)	Sep. 06, 2013 USD ($)	Nov. 30, 2013 USD ($)	Sep. 26, 2015	Dec. 27, 2014 USD ($)	Dec. 28, 2013 USD ($)	Dec. 31, 2015 USD ($)		Dec. 27, 2014 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jun. 29, 2013 USD ($)	Mar. 30, 2015 EUR (€)	Dec. 05, 2014 EUR (€)	Nov. 08, 2013 USD ($)	Jul. 28, 2013 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
Annual maturities of debt, next twelve months																		$ 1,019.7
Annual maturities of debt, year two																		576.6
Annual maturities of debt, year three																		667.9
Annual maturities of debt, year four																		742.6
Annual maturities of debt, year five																		0.0
Annual maturities of debt: Thereafter																		2,946.5
Term loans													$ 1,000.0					488.8			$ 530.5	$ 930.0
Long-term Line of Credit																		680.0			0.0	0.0
Senior notes																		4,698.3			4,720.9	2,300.0				$ 2,300.0
Other financing																		86.0			13.0	10.2
Unamortized premium, net																		73.4			87.5	(6.0)
Deferred financing fees																		(36.6)			(40.5)	(27.4)
Total borrowings outstanding																		5,989.9			5,311.4	3,206.8
Debt, Short Term and Current Portion of Long Term																		(1,018.3)			(64.6)	(143.7)
Total long-term debt, less current portion																		4,971.6			5,246.9	3,063.1
Payments for Deposits Applied to Debt Retirements																						133.5
Write off of financing fees on bridge credit agreements																						19.0
Line of Credit Facility, Collateral								364 days
Debt Instrument, Issuance Date						Dec. 05, 2014		Nov. 06, 2014	Jul. 28, 2013				Sep. 06, 2013
Line of Credit Facility, Maximum Borrowing Capacity | €																									€ 1,000.0
Line of Credit Facility, Fair Value of Amount Outstanding																		300.0			0.0	0.0
Repayments of Long-term Debt																		28.3			1,823.5	2,035.0	$ 40.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount						$ 895.0
Write off of financing fees																						10.5
Write-off of unamortized discount																						2.8
Total loss on extinguishment of debt																$ (9.6)	$ (165.8)	0.9		$ 9.6	$ 10.5	$ 165.8	$ 0.0
12.09.2015 Revolving credit facility [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Fair Value of Amount Outstanding																		$ 380.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount						750.0
2014 Euro-Denominated Term Loan due December 5, 2019 additional draw [Domain]
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount | €																									368.6
2014 term loan due December 18, 2015 [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount						300.0
2014 Euro-Denominated Term Loan due December 5, 2019 [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount | €																									614.3
3.5% Senior note due 2021 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage							3.50%											3.50%
Debt Instrument, Maturity Date															Dec. 15, 2021
Debt Instrument, Issuance Date							Dec. 02, 2014
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount							$ 500.0
3.9% senior note due 2024 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage							3.90%											3.90%
Debt Instrument, Maturity Date																		Dec. 15, 2024
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount							$ 700.0
4.9% Senior Loan due 2044 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage							4.90%											4.90%
Debt Instrument, Maturity Date																		Dec. 15, 2044
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount							$ 400.0
1.30% Unsecured Senior Notes due November 8, 2016 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		1.30%			1.30%	1.30%
Debt Instrument, Maturity Date																		Nov. 08, 2016			Nov. 08, 2016	Nov. 08, 2016
2.30% Unsecured Senior notes November 8, 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		2.30%			2.30%	2.30%
Debt Instrument, Maturity Date																		Nov. 08, 2018			Nov. 08, 2018	Nov. 08, 2018
4.00% Unsecured Senior Notes due November 15, 2023 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		4.00%			4.00%	4.00%
Debt Instrument, Maturity Date																		Nov. 15, 2023			Nov. 15, 2023	Nov. 15, 2023
5.30% Unsecured Senior Notes due November 15, 2043 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		5.30%			5.30%	5.30%
Debt Instrument, Maturity Date																		Nov. 15, 2043			Nov. 15, 2043	Nov. 15, 2043
Bridge Credit Agreements [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity | €								€ 2,200.0
2014 bonds [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes																					$ 1,600.0
Revolving Credit Facility [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount						$ 600.0
Debt Bridge Credit Agreement [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity																											$ 2,650.0
Cash Bridge Credit Agreement [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity																											$ 1,700.0
2014 Revolver [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Term loans																					$ 300.0	$ 0.0
2013 Term Loan due December 18, 2015 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Maturity Date																		Dec. 18, 2015			Dec. 18, 2015	Dec. 18, 2015
Term loans													$ 300.0					$ 0.0			$ 0.0	$ 300.0
2013 Term Loan due December 18, 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Maturity Date																		Dec. 18, 2018			Dec. 18, 2018	Dec. 18, 2018
Term loans													$ 700.0					$ 0.0			$ 0.0	$ 630.0
2014 Euro-Denominated Term Loan due December 5, 2019 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Maturity Date																		Dec. 05, 2019			Dec. 05, 2019	Dec. 05, 2019
Term loans																		$ 488.8			$ 530.5	$ 0.0
1.30% Unsecured Senior Notes due November 8, 2016 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[1]																	$ 500.0			500.0	500.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount																										500.0
4.500% Unsecured Senior Notes due May 23, 2017 [Domain]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		4.50%
Debt Instrument, Maturity Date																		May 23, 2017
Senior notes	[2]																	$ 195.5	[3]		201.0	0.0
5.125% Unsecured Senior Notes due December 12, 2017 [Domain]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		5.125%
Debt Instrument, Maturity Date																		Dec. 12, 2017
Senior notes	[2]																	$ 325.8	[3]		335.0	0.0
2.30% Unsecured Senior notes November 8, 2018 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[1]																	$ 600.0			600.0	600.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount																										600.0
5.000% Unsecured Senior notes due May 23, 2019 [Domain]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		5.00%
Debt Instrument, Maturity Date																		May 23, 2019
Senior notes	[2]																	$ 130.3	[3]		134.1	0.0
3.5% Senior note due 2021 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[4]																	$ 500.0			500.0	0.0
5.105% Senior note due July 19, 2023 [Domain]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage																		5.105%
Debt Instrument, Maturity Date																		Jul. 19, 2023
Senior notes	[2]																	$ 146.7	[3]		150.8	0.0
4.00% Unsecured Senior Notes due November 15, 2023 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[1]																	800.0			800.0	800.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount																										800.0
3.9% senior note due 2024 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[4]																	700.0			700.0	0.0
5.30% Unsecured Senior Notes due November 15, 2043 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[1]																	400.0			400.0	400.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount																										$ 400.0
4.9% Senior Loan due 2044 [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Senior notes	[4]																	400.0			400.0	0.0
2011 Term Loan due October 26, 2016 [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount												$ 360.0
2.95% Unsecured Senior Notes due May 15, 2023 [Member] | Tender Offer [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Repayments of Debt														$ 578.3
2.95% Unsecured Senior Notes due May 15, 2023 [Member] | Redemption [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Repayments of Debt										$ 28.5
Senior notes [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Repayments of Debt											$ 1,100.0
2015 Revolver [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Short term debt																		380.0			0.0	0.0
Omega [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Maturity Date				Jan. 01, 2016	Jan. 01, 2016
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt				$ 1,471.0
Gains (Losses) on Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount		$ 539.1
Omega [Member] | 4.5% Retail Bond [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage				4.50%																				4.50%
Debt Instrument, Maturity Date				Jan. 01, 2017	Jan. 01, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				$ 196.0
Omega [Member] | Over Draft [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				$ 56.0
Omega [Member] | 5.0% Retail Bond [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage				5.00%																				5.00%
Debt Instrument, Maturity Date				Jan. 01, 2019	Jan. 01, 2019
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				$ 130.7
Omega [Member] | Credit facility indebtedness [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				$ 544.5
Omega [Member] | 5.125% Retail Bond [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage				5.125%																				5.125%
Debt Instrument, Maturity Date				Jan. 01, 2017	Jan. 01, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				$ 326.7
Omega [Member] | 6.19% Senior Note [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage				6.19%																				6.19%
Omega [Member] | 5.1045% Senior Note [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Interest Rate, Stated Percentage				5.1045%																				5.1045%
Debt Instrument, Maturity Date				Jan. 01, 2023	Jan. 01, 2023
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt				$ 147.0
Perrigo Co PLC [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term debt, less current portion																		4,971.6			$ 5,246.8	$ 3,063.1
Omega [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Amount debt exceeded par value				101.9
Omega [Member] | Omega [Member] | 6.19% Senior Note [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				$ 20.0
Euro Member Countries, Euro | 2014 Euro-Denominated Term Loan due December 5, 2019 additional draw [Domain]
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount | €																									300.0
Euro Member Countries, Euro | 2014 Euro-Denominated Term Loan due December 5, 2019 [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Debt Instrument, Face Amount | €																									€ 500.0
Euro Member Countries, Euro | Bridge Credit Agreements [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity | €								€ 1,750.0
Euro Member Countries, Euro | Omega [Member]
Gains (Losses) on Extinguishment of Debt [Abstract]
Extinguishment of Debt, Amount | €			€ 500.0
Euro Member Countries, Euro | Omega [Member] | 4.5% Retail Bond [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | €																								€ 180.0
Euro Member Countries, Euro | Omega [Member] | Over Draft [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | €																								51.4
Euro Member Countries, Euro | Omega [Member] | 5.0% Retail Bond [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | €																								120.0
Euro Member Countries, Euro | Omega [Member] | Credit facility indebtedness [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | €																								500.0
Euro Member Countries, Euro | Omega [Member] | 5.125% Retail Bond [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | €																								300.0
Euro Member Countries, Euro | Omega [Member] | 5.1045% Senior Note [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | €																								€ 135.0
Euro Member Countries, Euro | Omega [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Amount debt exceeded par value | €					€ 93.6
BCH [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Line of Credit, Current																		$ 82.9

[1] (2) Private placement unsecured senior notes with registration rights as of June 28, 2014 and public bonds as of October 1, 2014, discussed below collectively as the "2013 Bonds."

[2] Debt assumed from Omega.

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

[4] (1) Public bonds issued on December 2, 2014, discussed below collectively as the "2014 Bonds."