Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions	Jul. 01, 2011	Dec. 31, 2010
Investments in marketable securities	$ 844.4	$ 925.7
Other marketable securities	167.5	213.6
Derivative financial instruments - Assets	0.2	0.2
Total Assets	1,012.1	1,139.5
Loan related to other marketable securities	167.5	213.6
Derivative financial instruments - Liabilities	0.3	1.0
Total Liabilities	167.8	214.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investments in marketable securities	98.0	258.4
Other marketable securities	167.5	213.6
Total Assets	265.5	472.0
Loan related to other marketable securities	167.5	213.6
Total Liabilities	167.5	213.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| U.S. Government Debt Obligations [Member]
Investments in marketable securities	98.0	258.4
Significant Other Observable Inputs (Level 2) [Member]
Investments in marketable securities	746.4	667.3
Derivative financial instruments - Assets	0.2	0.2
Total Assets	746.6	667.5
Derivative financial instruments - Liabilities	0.3	1.0
Total Liabilities	0.3	1.0
Significant Other Observable Inputs (Level 2) [Member] \| Foreign Government Debt Obligations [Member]
Investments in marketable securities	221.4	202.1
Significant Other Observable Inputs (Level 2) [Member] \| Certificates Of Deposit Guaranteed By FDIC [Member]
Investments in marketable securities	2.0	3.3
Significant Other Observable Inputs (Level 2) [Member] \| Mortgage-Backed Debt Obligations Guaranteed By GNMA [Member]
Investments in marketable securities	99.2	175.1
Significant Other Observable Inputs (Level 2) [Member] \| Corporate Debt Obligations Guaranteed By FDIC [Member]
Investments in marketable securities	103.0	102.6
Significant Other Observable Inputs (Level 2) [Member] \| Corporate Debt Obligations [Member]
Investments in marketable securities	229.2	95.9
Significant Other Observable Inputs (Level 2) [Member] \| Foreign Corporate Debt Obligations Guaranteed By Foreign Governments [Member]
Investments in marketable securities	91.6	88.3
Foreign Government Debt Obligations [Member]
Investments in marketable securities	221.4	202.1
Certificates Of Deposit Guaranteed By FDIC [Member]
Investments in marketable securities	2.0	3.3
Mortgage-Backed Debt Obligations Guaranteed By GNMA [Member]
Investments in marketable securities	99.2	175.1
U.S. Government Debt Obligations [Member]
Investments in marketable securities	98.0	258.4
Corporate Debt Obligations Guaranteed By FDIC [Member]
Investments in marketable securities	103.0	102.6
Corporate Debt Obligations [Member]
Investments in marketable securities	229.2	95.9
Foreign Corporate Debt Obligations Guaranteed By Foreign Governments [Member]
Investments in marketable securities	$ 91.6	$ 88.3

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.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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