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Inventories (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventories      
Raw materials $ 199.0 $ 175.5  
Work-in-process 197.0 169.4  
Finished goods 160.5 175.3  
Demonstration units 55.0 56.0  
Inventories 611.5 576.2  
Inventory-in-transit 93.9 116.8  
Write-down of demonstration units $ 31.5 $ 30.0 $ 24.4