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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 180.3 $ 159.2
Work-in-process 150.1 112.0
Finished goods 280.3 238.0
Total inventories 610.7 509.2
Excess and obsolete inventory reserve (58.4) (56.1)
Inventories — net $ 552.3 $ 453.1