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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Raw materials, including parts and subassemblies $ 347.1 $ 312.9
Work-in-process 69.2 45.3
Finished goods 75.4 69.8
Total inventories 491.7 428.0
Excess of LIFO costs over FIFO costs 15.9 15.9
Inventories $ 507.6 $ 443.9