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REPORTABLE SEGMENT Sales and Operating Profit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015	Jan. 03, 2016
Segment Reporting Information [Line Items]
Segment sales	$ 4,067.5	$ 3,966.2	$ 11,924.8	$ 12,193.7
Sales	3,538.6	3,406.1	10,337.5	10,509.2
Operating profit	246.3	153.7	693.5	528.0
Goodwill	1,621.7		1,621.7		$ 1,619.5
Packaged Meats Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	1,682.9	1,630.6	5,084.9	4,885.8
Operating profit	136.8	112.3	516.8	461.1
Hog Production Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	711.4	759.8	2,008.1	2,350.8
Operating profit	34.5	47.1	(33.8)	79.8
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating profit	(29.8)	(35.1)	(85.5)	(91.1)
International Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	387.0	365.0	1,075.2	1,047.7
Operating profit	28.1	15.3	61.5	46.0
Fresh Pork Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	1,286.2	1,210.8	3,756.6	3,909.4
Operating profit	76.7	14.1	234.5	32.2
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment sales	(528.9)	(560.1)	(1,587.3)	(1,684.5)
Intersegment Eliminations \| Packaged Meats Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	0.0	0.0	(0.1)	(0.1)
Intersegment Eliminations \| Hog Production Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	(500.4)	(534.0)	(1,503.2)	(1,606.5)
Intersegment Eliminations \| International Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	(11.0)	(10.9)	(32.4)	(33.9)
Intersegment Eliminations \| Fresh Pork Segment [Member]
Segment Reporting Information [Line Items]
Segment sales	$ (17.5)	$ (15.2)	$ (51.6)	$ (44.0)