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Inventory (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Components of inventories    
Raw materials $ 166.4 $ 213.0
Work in process 712.0 577.6
Finished goods 171.1 143.0
Total inventory 1,049.5 933.6
Inventory, current 1,009.7 893.4
Inventory, Noncurrent $ 39.8 $ 40.2