Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Net sales	$ 1,194.0	$ 1,347.3
Cost of sales	729.6	814.2
Gross profit	464.4	533.1
Operating expenses
Distribution	21.1	21.8
Research and development	39.8	45.3
Selling	155.0	180.8
Administration	105.4	107.5
Impairment charges	12.2	403.9
Restructuring	38.7	5.4
Other operating income	(36.3)	0.0
Total operating expenses	335.9	764.7
Operating income (loss)	128.5	(231.6)
Tysabri® royalty stream	(17.1)	204.4
Interest expense, net	53.3	51.2
Other (income) expense, net	(3.5)	2.5
Loss on extinguishment of debt	0.0	0.4
Income (loss) before income taxes	95.8	(490.1)
Income tax expense	24.2	39.1
Net income (loss)	$ 71.6	$ (529.2)
Earnings (loss) per share
Basic earnings per share (in dollars per share)	$ 0.50	$ (3.70)
Diluted earnings per share (in dollars per share)	$ 0.50	$ (3.70)
Weighted-average shares outstanding
Basic	143.4	143.2
Diluted	143.6	143.2
Dividends declared per share (in dollars per share)	$ 0.16	$ 0.145