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Inventories (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Inventories      
Raw materials $ 198.1   $ 175.5
Work-in-process 206.1   169.4
Finished goods 183.9   175.3
Demonstration units 59.9   56.0
Inventories 648.0   576.2
Inventory-in-transit 118.1   116.8
Write-down of demonstration units $ 6.8 $ 6.5