Investments (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 01, 2011	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010	Dec. 31, 2010
Investments [Abstract]
Other-than-temporary impairment charges on investments	$ 1.2
Shares acquired in business acquisition	10.6		10.6
Shares borrowed in stock loan agreement			10.6
Value of other marketable securities and loan related to other marketable securities	167.5		167.5		213.6
Market price per share of other marketable securities and Loan related to other marketable securities	$ 15.86		$ 15.86		$ 20.23
Fees associated with the stock loan agreement	0.3	0.4	0.6	0.8
Investments in partnerships and start-up technology companies	$ 5.7		$ 5.7		$ 6.3

This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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