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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Components of inventories    
Finished goods $ 381.6 $ 287.2
Work in process 5.9 5.1
Raw materials and parts 192.4 183.4
Subtotal 579.9 475.7
Excess of current cost over last-in, first-out cost (57.1) (57.2)
Total inventories, net $ 522.8 $ 418.5