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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 85.1 $ 78.3
Raw materials 85.5 66.3
Work in process 18.5 12.7
Total inventories [1] $ 189.1 $ 157.3
[1]
Amounts at September 30, 2019 include inventories acquired in the MRL acquisition - see Note 2 – Acquisitions.