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Inventory (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Components of inventories    
Raw materials $ 249.5 $ 213.0
Work in process 607.9 577.6
Finished goods 144.1 143.0
Total inventory 1,001.5 933.6
Inventory, current 964.6 893.4
Inventory, Noncurrent $ 36.9 $ 40.2