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Inventories (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Inventories      
Raw materials $ 175.5 $ 143.7  
Work-in-process 169.4 174.8  
Finished goods 175.3 143.9  
Demonstration units 56.0 48.6  
Inventories 576.2 511.0  
Write-down of demonstration units 30.0 24.4 26.1
Inventory-in-transit $ 116.8 $ 85.3