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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of the components of inventories

The components of inventories as of September 30, 2017 and December 31, 2016 are summarized as follows:

 

($ in millions)

 

September 30,

2017

 

 

December 31,

2016

 

Inventories:

 

 

 

 

 

 

 

 

Raw materials

 

$

133.2

 

 

$

109.3

 

Work-in-process

 

 

125.9

 

 

 

88.4

 

Finished goods

 

 

272.4

 

 

 

270.9

 

Total inventories

 

 

531.5

 

 

 

468.6

 

Excess and obsolete inventory reserve

 

 

(49.3

)

 

 

(39.6

)

Inventories — net

 

$

482.2

 

 

$

429.0