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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Inventories      
Raw materials $ 140.4   $ 132.8
Work-in-process 195.2   181.0
Finished goods 104.7   91.8
Demonstration units 36.1   34.8
Inventories 476.4   440.4
Inventory-in-transit 46.0   $ 37.5
Write-down of demonstration inventories to net realizable value $ 2.8 $ 4.8