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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Components of inventories    
Finished goods $ 371.4 $ 300.0
Work in process 5.3 4.2
Raw materials and parts 204.8 178.3
Subtotal 581.5 482.5
Excess of current cost over last-in, first-out cost (63.4) (63.7)
Total inventories, net $ 518.1 $ 418.8