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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 786.3 $ 465.9
Work-in-progress 521.7 154.5
Finished goods 649.3 224.5
Total inventories $ 1,957.3 $ 844.9