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Inventories (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Inventories          
Raw materials $ 195.9   $ 195.9   $ 175.5
Work-in-process 205.1   205.1   169.4
Finished goods 175.8   175.8   175.3
Demonstration units 56.0   56.0   56.0
Inventories 632.8   632.8   576.2
Inventory-in-transit 100.9   100.9   116.8
Write-down of demonstration units $ 8.5 $ 8.4 $ 22.6 $ 22.0