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Inventories (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Inventories      
Raw materials $ 203.6   $ 199.0
Work-in-process 197.8   197.0
Finished goods 166.6   160.5
Demonstration units 53.7   55.0
Inventories 621.7   611.5
Inventory-in-transit 82.8   93.9
Write-down of demonstration units $ 7.8 $ 6.8