Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Oct. 22, 2015
Numerator:
Net income (loss)	$ 71.6	$ (529.2)
Denominator:
Weighted average shares outstanding for basic EPS	143,400,000	143,200,000
Dilutive effect of share-based awards	200,000	0
Weighted average shares outstanding for diluted EPS	143,600,000	143,200,000
Anti-dilutive share-based awards excluded from computation of diluted EPS	1,000,000	0
Share-based compensation arrangement by share-based payment award, options, exercises in period	14,400	79,000
Stock repurchase program, remaining authorized repurchase amount	$ 1,500.0
Perrigo Co PLC [Member]
Denominator:
Stock repurchase program, authorized amount			$ 2,000.0