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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventories:    
Raw materials $ 144.6 $ 122.0
Work-in-process 136.6 98.8
Finished goods 241.4 227.7
Total inventories 522.6 448.5
Excess and obsolete inventory reserve (51.1) (47.9)
Inventories — net $ 471.5 $ 400.6