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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 200.7 $ 177.7
Work-in-process 74.2 62.9
Finished goods 249.1 238.5
Reserves (32.8) (30.3)
Inventories $ 491.2 $ 448.8