Acquisitions and Divestitures - Fair value of Consideration Paid (Details) $ / shares in Units, $ in Millions	Mar. 30, 2015 USD ($) $ / shares shares	Dec. 18, 2013 USD ($) shares $ / shares
Omega
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Perrigo ordinary shares issued | shares	5,400,000
Shares outstanding (in shares) | shares	685,348,257
Perrigo per share price at transaction close (in dollars per share) | $ / shares	$ 167.64
Total value of Perrigo ordinary shares issued	$ 904.9
Cash consideration	2,078.3
Total consideration	$ 2,983.2
Elan
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Shares outstanding (in shares) | shares		515,700,000
Exchange ratio per share | shares		0.07636
Total Perrigo shares issued to acquisition shareholders | shares		39,400,000
Perrigo per share price at transaction close (in dollars per share) | $ / shares		$ 155.34
Total value of Perrigo ordinary shares issued		$ 6,117.2
Cash consideration		3,223.2
Cash consideration paid for vested acquisition stock options and share awards		111.5
Total consideration		$ 9,451.9