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Inventories (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Inventories      
Raw materials $ 202.3   $ 189.7
Work-in-process 198.3   196.5
Finished goods 170.0   155.3
Demonstration units 49.9   48.3
Inventories 620.5   589.8
Inventory-in-transit 86.4   81.9
Write-down of demonstration units $ 7.6 $ 7.8