The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Percentage of voting equity interests acquired in the business combination.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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The amount of acquisition cost of a business combination allocated to net tangible assets.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Goodwill and Other Intangible Assets - Acquisition Information (Details) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended				6 Months Ended		6 Months Ended
	Jul. 01, 2012 ASPEX Corporation [Member] USD ($)	Jul. 01, 2012 ASPEX Corporation [Member] USD ($)	Jan. 09, 2012 ASPEX Corporation [Member] USD ($)	Jul. 09, 2012 AP Tech [Member] Acquisition [Member] USD ($)	Aug. 01, 2012 Visualization Sciences Group [Member] Acquisition [Member] EUR (€)	Jul. 01, 2012 Developed technology [Member] ASPEX Corporation [Member] Years	Jan. 09, 2012 Developed technology [Member] ASPEX Corporation [Member] USD ($)	Jul. 01, 2012 Customer Relationships [Member] ASPEX Corporation [Member] Years	Jan. 09, 2012 Customer Relationships [Member] ASPEX Corporation [Member] USD ($)	Jan. 09, 2012 Materials Science [Member] ASPEX Corporation [Member] USD ($)
Business Acquisition [Line Items]
Percentage of voting interests acquired			100.00%		100.00%
Acquisition purchase price			$ 30.5	$ 11.4	€ 44.8
Acquisition related transaction costs			0.2
Net tangible assets acquired, fair value			1.9
Net intangible assets acquired, fair value			9.7				6.4		1.7
Net intangible assets acquired, weighted average amortization period						7.0		5.0
Acquisition related goodwill, adjusted for deferred tax liabilities										22.0
Tax deductible goodwill			1.3
Revenue	3.4	6.2
Net income	$ 0.5	$ 0.2