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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Components of inventories    
Finished goods $ 335.5 $ 300.0
Work in process 6.8 4.2
Raw materials and parts 193.8 178.3
Subtotal 536.1 482.5
Excess of current cost over last-in, first-out cost (62.1) (63.7)
Total inventories, net $ 474.0 $ 418.8