Inventories (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Inventories
Raw materials	$ 185.3		$ 185.3		$ 143.7
Work-in-process	185.9		185.9		174.8
Demonstration units	55.0		55.0		48.6
Finished goods	175.2		175.2		143.9
Inventories	601.4		601.4		511.0
Inventory-in-transit	112.6		112.6		85.3
Write-down of demonstration units	$ 8.4	$ 6.0	$ 22.0	$ 17.3

Charge to cost of revenue that represents the reduction of the carrying amount of demonstration inventory, generally attributable to the age of the unit, the physical condition and assessment of technological obsolescence.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies to which the entity holds the title and uses for the specific purpose of showing the benefits and features of the entity's products to existing or potential customers.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Carrying amount as of the balance sheet date of merchandise or supplies to which the entity holds the title but does not hold physical possession because the goods are currently being transported.

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