Inventories (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Inventories
Raw materials	$ 159.8		$ 159.8		$ 143.7
Work-in-process	227.1		227.1		174.8
Demonstration units	56.9		56.9		48.6
Finished goods	174.9		174.9		143.9
Inventories	618.7		618.7		511.0
Inventory-in-transit	116.5		116.5		85.3
Write-down of demonstration units to net realizable value, recorded in cost of revenue	$ 7.1	$ 5.6	$ 19.4	$ 11.2

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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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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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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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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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