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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Components of inventories    
Finished goods $ 369.1 $ 287.2
Work in process 8.6 5.1
Raw materials and parts 209.4 183.4
Subtotal 587.1 475.7
Excess of current cost over last-in, first-out cost (56.2) (57.2)
Total inventories, net $ 530.9 $ 418.5