Fair Value (Fair Value Of Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 25, 2011 years
Auction rate securities maturity period in years, minimum	4
Auction rate securities maturity period in years, maximum	10
Marketable securities	$ 31.7
Fair Value Measurements, Recurring [Member]
Assets	0.5
Liabilities	(7.9)
Total foreign currency derivatives	(7.4)
Total securities	31.7
Fair Value Measurements, Recurring [Member] \| Auction Rate Securities [Member]
Total securities	29.0
Fair Value Measurements, Recurring [Member] \| Auction Rate Securities [Member] \| Fair Value, Significant Unobservable Inputs (Level 3) [Member]
Total securities	29.0
Fair Value Measurements, Recurring [Member] \| Marketable Securities [Member]
Marketable securities	2.7
Fair Value Measurements, Recurring [Member] \| Marketable Securities [Member] \| Fair Value, Quoted Prices in Active Markets (Level 1) [Member]
Marketable securities	2.7
Fair Value Measurements, Recurring [Member] \| Fair Value, Quoted Prices in Active Markets (Level 1) [Member]
Total securities	2.7
Fair Value Measurements, Recurring [Member] \| Fair Value, Significant Other Observable Inputs (Level 2) [Member]
Assets	0.5
Liabilities	(7.9)
Total foreign currency derivatives	(7.4)
Fair Value Measurements, Recurring [Member] \| Fair Value, Significant Unobservable Inputs (Level 3) [Member]
Total securities	$ 29.0

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.