Acquisitions and Divestitures - 2014 Acquisitions (Details)					6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2014	Feb. 18, 2014	Dec. 18, 2013 USD ($) shares $ / shares	Aug. 06, 2009 USD ($)	Dec. 31, 2015 USD ($)	Oct. 01, 2016	Dec. 31, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	May 01, 2014
Business Acquisition [Line Items]
Finite lived assets, useful life						20 years
Goodwill					$ 5,152,700,000		$ 4,049,400,000	$ 4,721,200,000	$ 3,473,100,000
Purchase Accounting Adjustments					$ 420,100,000		700,000	$ (13,000,000)
Purchase of interests in cash									7,200,000
Aspen Global
Business Acquisition [Line Items]
Effective date of acquisition	Feb. 28, 2014
Fera (methazolomide)
Business Acquisition [Line Items]
Effective date of acquisition		Feb. 18, 2014
Elan
Business Acquisition [Line Items]
Effective date of acquisition			Dec. 18, 2013
Cash consideration paid on unvested stock options and awards									$ 16,100,000
Cash exchange per share (in dollars per share) | $ / shares			$ 6.25
Exchange ratio per share | shares			0.07636
Percentage of interest acquired			29.00%
Goodwill			$ 2,332,000,000
Perrigo Company
Business Acquisition [Line Items]
Percentage of interest acquired			71.00%
Vedants Drug & Fine Chemicals
Business Acquisition [Line Items]
Effective date of acquisition				Aug. 06, 2009
Percentage of interest acquired				85.00%					15.00%
Purchase of interests in cash				$ 11,500,000					$ 7,200,000
Customer-relationships | Aspen Global
Business Acquisition [Line Items]
Finite lived assets, useful life	15 years
Customer-relationships | Fera (methazolomide)
Business Acquisition [Line Items]
Finite lived assets, useful life		15 years
Trademarks, trade names, and brands | Aspen Global
Business Acquisition [Line Items]
Finite lived assets, useful life	25 years
Non-compete agreements | Aspen Global
Business Acquisition [Line Items]
Finite lived assets, useful life	5 years
Tysabri®
Business Acquisition [Line Items]
Percent of royalty revenues generated by specific agreement										12.00%
Minimum | Tysabri®
Business Acquisition [Line Items]
Percent of royalty revenues generated by specific agreement								18.00%
Net sales from acquisitions							$ 2,000,000,000
Maximum | Tysabri®
Business Acquisition [Line Items]
Percent of royalty revenues generated by specific agreement							25.00%
Net sales from acquisitions							$ 2,000,001,000