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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Raw materials $ 72.7 $ 65.9
Work in progress 26.5 21.3
Finished goods 88.1 60.8
Subtotal 187.3 148.0
Less reserves (26.7) (22.4)
Total $ 160.6 $ 125.6