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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Inventories          
Raw materials $ 151.9   $ 151.9   $ 158.8
Work-in-process 187.3   187.3   131.1
Finished goods 95.0   95.0   93.3
Demonstration units 36.8   36.8   38.8
Inventories 471.0   471.0   422.0
Inventory-in-transit 36.8   36.8   $ 44.7
Write-down of demonstration inventories to net realizable value $ 3.7 $ 4.9 $ 8.5 $ 9.9