Debt And Bank Credit Facilities (Details Of The Senior Notes) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Jan. 02, 2016
Debt Instrument [Line Items]
Senior Notes	$ 600.0
Senior Notes [Member]
Debt Instrument [Line Items]
Senior Notes	600.0
Senior Notes [Member] \| Floating Rate Series 2007A Mature In August 2017 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 100.0
Spread on variable interest rate	1.60%	1.10%
Senior Notes [Member] \| Fixed Rate Series 2011A Mature In July 2018 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 100.0
Debt instrument interest rate	4.10%
Senior Notes [Member] \| Fixed Rate Series 2011A Mature In July 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 230.0
Stated rate, minimum	4.80%
Stated rate, maximum	5.00%
Senior Notes [Member] \| Fixed Rate Series 2011A Mature In July 2023 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 170.0
Stated rate, minimum	4.90%
Stated rate, maximum	5.10%

The average effective interest rate during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
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-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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