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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of current inventories [abstract]          
Raw materials $ 897.6 $ 865.6      
Work in process 891.6 612.4      
Spare parts 424.3 405.2      
Finished goods 146.4 89.9      
Held by third parties 108.7 82.3      
Inventory in transit 91.1 85.2      
Consumption materials 48.3 47.6      
Used aircraft 46.0 102.0      
Advances to suppliers 31.4 28.9      
Loss on adjustment to market value (7.7) (17.2)      
Loss due to obsolescence (170.7) (153.2)   $ (138.1) $ (161.2)
Total $ 2,507.0 $ 2,148.7 $ 2,496.4