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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Components of inventories |  |
Finished goods | $ 397.0 | $ 331.9
Work in process | 6.2 | 5.5
Raw materials and parts | 210.9 | 199.2
Subtotal | 614.1 | 536.6
Excess of current cost over last-in, first-out cost | (52.6) | (52.4)
Total inventories, net | $ 561.5 | $ 484.2

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