Earnings Per Share (Details) - USD ($) $ in Millions		3 Months Ended
		Apr. 02, 2016	Mar. 28, 2015	Oct. 22, 2015
Stock Repurchase Program, Number of shares repurchased		0
Numerator:
Net loss		$ (334.6)	$ (94.9)
Denominator:
Weighted average shares outstanding for basic EPS		143,200,000	140,800,000
Dilutive effect of share-based awards	[1]	0	0
Weighted average shares outstanding for diluted EPS		143,200,000	140,800,000
Anti-dilutive share-based awards excluded from computation of diluted EPS		300,000	700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		79,000	35,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 1,500.0
Perrigo Co PLC [Member]
Denominator:
Stock Repurchase Program, Authorized Amount				$ 2,000.0

[1] In the period of a net loss, diluted shares equal basic shares.