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Inventories (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Inventories          
Raw materials $ 186.7   $ 186.7   $ 175.5
Work-in-process 202.0   202.0   169.4
Finished goods 170.9   170.9   175.3
Demonstration units 60.7   60.7   56.0
Inventories 620.3   620.3   576.2
Inventory-in-transit 92.4   92.4   116.8
Write-down of demonstration units $ 7.3 $ 7.1 $ 14.1 $ 13.6