Acquisitions ProForma net sales (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue									$ 3,291.2	$ 3,240.4	$ 3,328.8
Business Acquisition, Pro Forma Net Income (Loss)									$ 28.8	$ 123.8	$ 202.4
Earnings Per Share, Basic	$ (2,610,000.00)us-gaap_EarningsPerShareBasic	$ 1,060,000.00us-gaap_EarningsPerShareBasic	$ 1,240,000.00us-gaap_EarningsPerShareBasic	$ 970,000.00us-gaap_EarningsPerShareBasic	$ (740,000.00)us-gaap_EarningsPerShareBasic	$ 1,170,000.00us-gaap_EarningsPerShareBasic	$ 1,140,000.00us-gaap_EarningsPerShareBasic	$ 1,100,000.00us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 2.66us-gaap_EarningsPerShareBasic	$ 4.68us-gaap_EarningsPerShareBasic
Business Acquisition, Pro Forma Earnings Per Share, Basic									$ 0.64	$ 2.75	$ 0
Earnings Per Share, Diluted	$ (2,610,000.00)us-gaap_EarningsPerShareDiluted	$ 1,050,000.00us-gaap_EarningsPerShareDiluted	$ 1,240,000.00us-gaap_EarningsPerShareDiluted	$ 960,000.00us-gaap_EarningsPerShareDiluted	$ (740,000.00)us-gaap_EarningsPerShareDiluted	$ 1,160,000.00us-gaap_EarningsPerShareDiluted	$ 1,130,000.00us-gaap_EarningsPerShareDiluted	$ 1,090,000.00us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 2.64us-gaap_EarningsPerShareDiluted	$ 4.64us-gaap_EarningsPerShareDiluted
Business Acquisition, Pro Forma Earnings Per Share, Diluted									$ 0.64	$ 2.73	$ 0

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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