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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Raw materials $ 90.2   $ 88.6
Work in process 39.0   31.8
Finished goods 79.0   94.8
Total inventories $ 208.2 $ 194.4 $ 215.2