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Inventories (Tables)
 3 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventories consisted of the following (in millions):
 
December 31,
 
September 30,
 
2016
 
2016
Raw materials
$
559.2

 
$
481.2

Partially finished products
360.8

 
307.8

Finished products
379.4

 
286.9

Inventories at FIFO cost
1,299.4

 
1,075.9

Less: Progress/performance-based payments on U.S. government contracts
(10.6
)
 
(17.8
)
          Excess of FIFO cost over LIFO cost
(80.1
)
 
(78.3
)
 
$
1,208.7

 
$
979.8