Acquisitions - Consideration for Acquisition (Details) - Omega $ / shares in Units, shares in Millions, $ in Millions	Mar. 30, 2015 USD ($) $ / shares shares
Business Acquisition [Line Items]
Perrigo ordinary shares issued (in shares) | shares	5.4
Perrigo share price at transaction close on March 30, 2015 (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